Document:

<PAGE>

                                 EXHIBIT 10.22
                                 -------------

                     EXECUTIVE SUPPLEMENTAL RETIREMENT PLAN

                              EXECUTIVE AGREEMENT

     THIS AGREEMENT is made and entered into this 13th day of January, 2000, by
and between Community Trust Bank, a Bank organized and existing under the laws
of the State of Georgia, (hereinafter referred to as the, "Bank"), and Angel J.
Byrd, an Executive of the Bank (hereinafter referred to as the, "Executive").

     WHEREAS, the Board believes that the Executive's experience, knowledge of
corporate affairs, reputation and industry contacts are of such value, and the
Executive's continued services so essential to the Bank's future growth and
profits, that it would suffer severe financial loss should the Executive
terminate their service with the Bank;

     ACCORDINGLY, the Board has adopted the Community Trust Bank Executive
Supplemental Retirement Plan (hereinafter referred to as the, "Executive Plan")
and it is the desire of the Bank and the Executive to enter into this agreement
which the Bank will agree to make certain payments to the Executive upon the
Executive's retirement and to the Executive's beneficiary(ies) in the event of
the Executive's death pursuant to the Executive Plan;

     FURTHERMORE, it is the intent of the parties hereto that this Executive
Plan be considered an unfunded arrangement maintained primarily to provide
supplemental retirement benefits for the Executive, and to be considered a non-
qualified benefit plan for purposes of the Employee Retirement Security Act of
1974, as amended ("ERISA").  The Executive is fully advised of the Bank's
financial status and has had substantial input in the design and operation of
this benefit plan; and

     NOW THEREFORE, in consideration of services the Executive has performed in
the past and those to be performed in the future, and based upon the mutual
promises and covenants herein contained, the Bank and the Executive agree as
follows:

I.  DEFINITIONS

     A.  Effective Date:
         --------------

         The Effective Date of the Plan shall be January 3, 2000.

     B.  Plan Year:
         ---------

         Any reference to the "Plan Year" shall mean a calendar year from
         January 1st to December 31st.  In the year of implementation, the term
         the "Plan
<PAGE>

         Year" shall mean the period from the Effective Date to December 31st of
         the year of the Effective Date.

     C.  Retirement Date:
         ---------------

         Retirement Date shall mean retirement from service with the Bank, which
         becomes effective on the first day of the calendar month following the
         month in which the Executive reaches age sixty-five (65) or such later
         date as the Executive may actually retire.

     D.  Termination of Service:
         ----------------------

         Termination of Service shall mean the Executive's voluntary resignation
         of service by the Executive or the Bank's discharge of the Executive
         without cause, prior to the Normal Retirement Age [Subparagraph I (J)].

     E.  Pre-Retirement Account:
         ----------------------

         A Pre-Retirement Account shall be established as a liability reserve
         account on the books of the Bank for the benefit of the Executive.
         Prior to the Executive's Retirement Date [Subparagraph I (C)], such
         liability reserve account shall be increased or decreased each Plan
         Year, until the aforestated event occurs, by the Index Retirement
         Benefit [Subparagraph I (F)].

     F.  Index Retirement Benefit:
         ------------------------

         The Index Retirement Benefit for each Executive in the Executive Plan
         for each Plan Year shall be equal to the excess (if any) of the Index
         [Subparagraph I (G)] for that Plan Year over the Cost of Funds Expense
         [Subparagraph I (H)] for that Plan Year.

     G.  Index:
         -----

         The Index for any Plan Year shall be the aggregate annual after-tax
         income from the life insurance contract(s) described hereinafter as
         defined by FASB Technical Bulletin 85-4. This Index shall be applied as
         if such insurance contract(s) were purchased on the Effective Date of
         the Executive Plan.

         Insurance Company:   Alexander Hamilton Life Insurance Company
         Policy Form:         Flexible Premium Adjustable Life Policy
         Policy Name:         Executive Security Plan IV
         Insured's Age and Sex: 44/Female

                                       2
<PAGE>

         Riders:             None
         Ratings:            According to the health of the proposed insured
         Option:             Level
         Face Amount:        $349,000
         Premiums Paid:      $100,000
         Number of Premium Payments:  Single
         Assumed Purchase Date: January 3, 2000

         Insurance Company:  Southland Life Insurance Company
         Policy Form:        Flexible Premium Adjustable Life Policy
         Policy Name:        Max UL
         Insured's Age and Sex: 44/Female
         Riders:             None
         Ratings:            According to the health of the proposed insured
         Option:             Level
         Face Amount:        $378,941
         Premiums Paid:      $100,000
         Number of Premium Payments:  Single
         Assumed Purchase Date: January 3, 2000

         If such contracts of life insurance are actually purchased by the
         Bank, then the actual policies as of the dates they were actually
         purchased shall be used in calculations under this Executive Plan.  If
         such contracts of life insurance are not purchased or are subsequently
         surrendered or lapsed, then the Bank shall receive annual policy
         illustrations that assume the above-described policies were purchased
         or had not subsequently surrendered or lapsed, which illustration will
         be received from the respective insurance companies and will indicate
         the increase in policy values for purposes of calculating the amount
         of the Index.

         In either case, references to the life insurance contracts are merely
         for purposes of calculating a benefit.  The Bank has no obligation to
         purchase such life insurance and, if purchased, the Executives and
         their beneficiary(ies) shall have no ownership interest in such policy
         and shall always have no greater interest in the benefits under this
         Executive Plan than that of an unsecured creditor of the Bank.

     H.  Cost of Funds Expense:
         ---------------------

         The Cost of Funds Expense for any Plan Year shall be calculated by
         taking the sum of the amount of premiums for the life insurance
         policies described in the definition of "Index" plus the amount of any
         after-tax benefits paid to any Executive pursuant to the Executive
         Plan (Paragraph II hereinafter) plus the amount of all previous years
         after-tax Costs of Funds Expense, and multiplying that sum by the
         Average After-Tax Cost of Funds [Subparagraph I (K)].

                                       3
<PAGE>

     I.  Change of Control:
         -----------------

         Change of Control shall be as defined in paragraph 10.03, "Change in
         ---------
         Control" Defined, of the Employment Agreement Angel J. Byrd and
         ----------------         --------------------
         Community Trust Financial Services Corporation dated January 3, 2000
         (hereinafter referred to as the, "Executive's Employment Agreement"),
         attached hereto, marked as Exhibit "A", and fully incorporated herein
         by reference.

     J.  Normal Retirement Age:
         ----------------------

         Normal Retirement Age shall mean the date on which the Executive
         attains age sixty-five (65).

     K.  Average After-Tax Cost of Funds:
         -------------------------------

         Average After-Tax Cost of Funds means, at any particular time, a
         ratio, the numerator of which is the total interest expense as set
         forth on Schedule RI-Income Statement on the Bank's most recently
         filed Consolidated Report of Condition and Income (the "Call Report")
         and the denominator of which is an amount equal to:  (i) the amount of
         deposits in domestic offices (sum of total of columns A and C from
         Schedule RC-E of the Call Report), plus (ii) the amount of Federal
         funds purchased and securities sold under agreements to repurchase, as
         set forth on Schedule RC-Balance Sheet of the Call Report.

II.  INDEX BENEFITS

     A.  Retirement Benefits:
         -------------------

         Subject to Subparagraph II (D) hereinafter, an Executive who remains in
         the employ of the Bank until the Normal Retirement Age [Subparagraph I
         (J)] shall be entitled to receive the balance in the Pre-Retirement
         Account in ten (10) equal annual installments commencing thirty (30)
         days following the Executive's retirement. In addition to these
         payments and commencing in conjunction therewith, the Index Retirement
         Benefit [Subparagraph I (F)] for each Plan Year subsequent to the
         Executive's retirement, and including the remaining portion of the Plan
         Year following said retirement, shall be paid to the Executive until
         the Executive's death.

     B.  Termination of Service:
         ----------------------

         Subject to Subparagraph II (D), should an Executive suffer a
         Termination of Service the Executive shall be entitled to receive the
         following percentage of the balance in the Pre-Retirement Account that
         corresponds

                                       4
<PAGE>

         to the age of the Executive upon the date of said termination of
         service, said amount payable to the Executive in ten (10) equal annual
         installments commencing thirty (30) days following the Executive's
         Normal Retirement Age [Subparagraph I (J)]. In addition to these
         payments and commencing in conjunction therewith, the following
         percentage of the Index Retirement Benefit for each Plan Year
         subsequent to the year in which the Executive attains Normal Retirement
         Age (including the remaining portion of the Plan Year in which the
         Executive attains Normal Retirement Age) that corresponds to the age of
         the Executive at the time of the Executive's termination of service,
         shall be paid to the Executive until the Executive's death.

                                                     Vested Percentage
                      Age of Executive             (to a maximum of 100%)
                      ----------------             ----------------------
                     Age 55 or younger                      0%
                         56                                10%
                         57                                20%
                         58                                30%
                         59                                40%
                         60                                50%
                         61                                60%
                         62                                70%
                         63                                80%
                         64                                90%
                         65 or more                       100%

     C.  Death:
         -----

         Should the Executive die prior to having received the balance of the
         Pre-Retirement Account the Executive may be entitled to under the terms
         of this Executive Plan, the entire unpaid balance of the Executive's
         Pre-Retirement Account shall be paid in a lump sum to the individual or
         individuals the Executive may have designated in writing and filed with
         the Bank. In the absence of any effective designation of
         beneficiary(ies), the unpaid balance shall be paid as set forth herein
         to the duly qualified executor or administrator of the Executive's
         estate. Said payment due hereunder shall be made the first day of the
         second month following the decease of the Executive. Provided, however,
         that anything hereinabove to the contrary notwithstanding, no death
         benefit shall be payable hereunder if the Executive dies on or before
         the 3rd day of January, 2002.

     D.  Discharge for Cause and Other Termination of this Agreement:
         -----------------------------------------------------------

         Notwithstanding anything herein to the contrary, should the Executive
         be Discharged for Cause at any time, suffer a termination of service
         prior to

                                       5
<PAGE>

         age fifty-six (56), or breach any of the provisions of the Executive's
         Employment Agreement, all benefits under this Executive Plan shall be
         forfeited. The term for "cause" shall be as defined in subparagraph
         10.01 (c) of the Executive's Employment Agreement.

         The provisions of the Executive's Employment Agreement specifically
         referred to in this Subparagraph II (D) shall be, but are not limited
         to: (i) Paragraph 5, "Confidentiality"; (ii) Paragraph 6, "Solicitation
         of Customers, Borrowers or Depositors"; (iii) Paragraph 7, "Non-
         Interference with Personnel Relations"; (iv) Paragraph 8, "Notification
         of Subsequent Employment"; and (v) Paragraph 9, "Covenant Not to
         Compete".

     E.  Death Benefit:
         -------------

         Except as set forth above, there is no death benefit provided under
         this Agreement.

III. RESTRICTIONS UPON FUNDING

     The Bank shall have no obligation to set aside, earmark or entrust any fund
     or money with which to pay its obligations under this Executive Plan.  The
     Executive, their beneficiary(ies), or any successor in interest shall be
     and remain simply a general creditor of the Bank in the same manner as any
     other creditor having a general claim for matured and unpaid compensation.

     The Bank reserves the absolute right, at its sole discretion, to either
     fund the obligations undertaken by this Executive Plan or to refrain from
     funding the same and to determine the extent, nature and method of such
     funding. Should the Bank elect to fund this Executive Plan, in whole or in
     part, through the purchase of life insurance, mutual funds, disability
     policies or annuities, the Bank reserves the absolute right, in its sole
     discretion, to terminate such funding at any time, in whole or in part. At
     no time shall any Executive be deemed to have any lien nor right, title or
     interest in or to any specific funding investment or to any assets of the
     Bank.

     If the Bank elects to invest in a life insurance, disability or annuity
     policy upon the life of the Executive, then the Executive shall assist the
     Bank by freely submitting to a physical exam and supplying such additional
     information necessary to obtain such insurance or annuities.

IV.  CHANGE OF CONTROL

     Upon a Change of Control [Subparagraph I (I)], if the Executive
     subsequently suffers a Termination of Service [Subparagraph I (D)], then
     the Executive shall

                                       6
<PAGE>

     receive the benefits promised in this Executive Plan upon attaining Normal
     Retirement Age, as if the Executive had been continuously employed by the
     Bank until the Executive's Normal Retirement Age. The Executive will also
     remain eligible for all promised death benefits in this Executive Plan. In
     addition, no sale, merger, or consolidation of the Bank shall take place
     unless the new or surviving entity expressly acknowledges the obligations
     under this Executive Plan and agrees to abide by its terms.

V.   MISCELLANEOUS

     A.   Alienability and Assignment Prohibition:
          ---------------------------------------

          Neither the Executive, nor the Executive's surviving spouse, nor any
          other beneficiary(ies) under this Executive Plan shall have any power
          or right to transfer, assign, anticipate, hypothecate, mortgage,
          commute, modify or otherwise encumber in advance any of the benefits
          payable hereunder nor shall any of said benefits be subject to seizure
          for the payment of any debts, judgments, alimony or separate
          maintenance owed by the Executive or the Executive's beneficiary(ies),
          nor be transferable by operation of law in the event of bankruptcy,
          insolvency or otherwise.  In the event the Executive or any
          beneficiary attempts assignment, commutation, hypothecation, transfer
          or disposal of the benefits hereunder, the Bank's liabilities shall
          forthwith cease and terminate.

     B.   Binding Obligation of the Bank and any Successor in Interest:
          ------------------------------------------------------------

          The Bank shall not merge or consolidate into or with another bank or
          sell substantially all of its assets to another bank, firm or person
          until such bank, firm or person expressly agrees, in writing, to
          assume and discharge the duties and obligations of the Bank under this
          Executive Plan.  This Executive Plan shall be binding upon the parties
          hereto, their successors, beneficiaries, heirs and personal
          representatives.

     C.   Amendment or Revocation:
          -----------------------

          It is agreed by and between the parties hereto that, during the
          lifetime of the Executive, this Executive Plan may be amended or
          revoked at any time or times, in whole or in part, by the mutual
          written consent of the Executive and the Bank.

                                       7
<PAGE>

     D.   Gender:
          ------

          Whenever in this Executive Plan words are used in the masculine or
          neuter gender, they shall be read and construed as in the masculine,
          feminine or neuter gender, whenever they should so apply.

     E.   Effect on Other Bank Benefit Plans:
          ----------------------------------

          Nothing contained in this Executive Plan shall affect the right of the
          Executive to participate in or be covered by any qualified or non-
          qualified pension, profit-sharing, group, bonus or other supplemental
          compensation or fringe benefit plan constituting a part of the Bank's
          existing or future compensation structure.

     F.   Headings:
          --------

          Headings and subheadings in this Executive Plan are inserted for
          reference and convenience only and shall not be deemed a part of this
          Executive Plan.

     G.   Applicable Law:
          --------------

          The validity and interpretation of this Agreement shall be governed by
          the laws of the State of Georgia.

     H.   12 U.S.C. (S) 1828(k):
          ---------------------

          Any payments made to the Executive pursuant to this Executive Plan, or
          otherwise, are subject to and conditioned upon their compliance with
          12 U.S.C. (S) 1828(k) or any regulations promulgated thereunder.

     I.   Partial Invalidity:
          ------------------

          If any term, provision, covenant, or condition of this Executive Plan
          is determined by an arbitrator or a court, as the case may be, to be
          invalid, void, or unenforceable, such determination shall not render
          any other term, provision, covenant, or condition invalid, void, or
          unenforceable, and the Executive Plan shall remain in full force and
          effect notwithstanding such partial invalidity.

     J.   Employment:
          ----------

          No provision of this Executive Plan shall be deemed to restrict or
          limit any existing employment agreement by and between the Bank and
          the Executive, nor shall any conditions herein create specific
          employment rights to the Executive nor limit the right of the Employer
          to discharge the

                                       8
<PAGE>

          Executive with or without cause. In a similar fashion, no provision
          shall limit the Executive's rights to voluntarily sever the
          Executive's employment at any time.

     K.   Employment Agreement:
          --------------------

          Angel J. Byrd and Community Trust Financial Services Corporation are
          parties to an Employment Agreement dated January 3, 2000.  Said
          Employment Agreement is attached hereto, marked as Exhibit "A", and
          fully incorporated herein by reference.

VI.  ERISA PROVISION

     A.   Named Fiduciary and Plan Administrator:
          --------------------------------------

          The "Named Fiduciary and Plan Administrator" of this Executive Plan
          shall be Community Trust Bank until its resignation or removal by the
          Board.  As Named Fiduciary and Plan Administrator, the Bank shall be
          responsible for the management, control and administration of the
          Executive Plan.  The Named Fiduciary may delegate to others certain
          aspects of the management and operation responsibilities of the
          Executive Plan including the employment of advisors and the delegation
          of ministerial duties to qualified individuals.

     B.   Claims Procedure and Arbitration:
          --------------------------------

          In the event a dispute arises over benefits under this Executive Plan
          and benefits are not paid to the Executive (or to the Executive's
          beneficiary(ies) in the case of the Executive's death) and such
          claimants feel they are entitled to receive such benefits, then a
          written claim must be made to the Named Fiduciary and Plan
          Administrator named above within sixty (60) days from the date
          payments are refused.  The Named Fiduciary and Plan Administrator
          shall review the written claim and if the claim is denied, in whole or
          in part, they shall provide in writing within sixty (60) days of
          receipt of such claim its specific reasons for such denial, reference
          to the provisions of this Executive Plan upon which the denial is
          based and any additional material or information necessary to perfect
          the claim.  Such written notice shall further indicate the additional
          steps to be taken by claimants if a further review of the claim denial
          is desired.  A claim shall be deemed denied if the Named Fiduciary and
          Plan Administrator fail to take any action within the aforesaid sixty-
          day period.

          If claimants desire a second review they shall notify the Named
          Fiduciary and Plan Administrator in writing within sixty (60) days of
          the first claim denial.  Claimants may review this Executive Plan or
          any documents relating thereto and submit any written issues and
          comments it may feel

                                       9
<PAGE>

          appropriate. In their sole discretion, the Named Fiduciary and Plan
          Administrator shall then review the second claim and provide a written
          decision within sixty (60) days of receipt of such claim. This
          decision shall likewise state the specific reasons for the decision
          and shall include reference to specific provisions of the Plan
          Agreement upon which the decision is based.

          If claimants continue to dispute the benefit denial based upon
          completed performance of this Executive Plan or the meaning and effect
          of the terms and conditions thereof, then claimants may submit the
          dispute to an Arbitrator for final arbitration as more fully set forth
          in paragraph 15, "Arbitration", of the Executive's Employment
                            -----------
          Agreement.

VII. TERMINATION OR MODIFICATION OF AGREEMENT BY REASON OF CHANGES IN THE LAW,
     RULES OR REGULATIONS

     The Bank is entering into this Agreement upon the assumption that certain
     existing tax laws, rules and regulations will continue in effect in their
     current form.  If any said assumptions should change and said change has a
     detrimental effect on this Executive Plan, then the Bank reserves the right
     to terminate or modify this Agreement accordingly.  Upon a Change of
     Control [Subparagraph I (I)], this paragraph shall become null and void
     effective immediately upon said Change of Control.

     IN witness whereof, the parties hereto acknowledge that each has carefully
read this Agreement and executed the original thereof on the 13th day of
January, 2000, and that, upon execution, each has received a conforming copy.

                                  COMMUNITY TRUST BANK
                                  Hiram, Georgia

/s/ Elizabeth Staples             By:  /s/ Ronnie Austin
----------------------------          -------------------
Witness - Elizabeth Staples           Ronnie Austin - CEO

/s/ T. E. Durham, Jr.                  /s/ Angel Byrd
----------------------------          -------------------
Witness - T. E. Durham, Jr.           Angel Byrd

                                       10<PAGE>

                              FIRST AMENDMENT TO
                               CREDIT AGREEMENT
                               ----------------

     This First Amendment to Credit Agreement (this "Amendment") is dated as of
August 11, 1998 and entered into by and among  U.S. XPRESS ENTERPRISES, INC.(the
"Borrower"), the BANKS listed on the signature pages hereof (the "Lenders"),
WACHOVIA BANK, N.A., as Administrative Agent, NATIONSBANK, N.A., as Syndication
Agent, BANKBOSTON, N.A.,as Documentation Agent, and SUNTRUST BANK, CHATTANOOGA,
N.A., as Co-Agent.

                                 W I T N E S S E T H:
                                 -------------------

     WHEREAS, the parties hereto are parties to that certain Credit Agreement,
dated as of January 15, 1998 (the "Credit Agreement"); and

     WHEREAS, the Borrower has requested that the Lenders increase the
Commitments under the Credit Agreement, modify the provisions of the Credit
Agreement concerning  acquisitions, and make certain other changes in the Credit
Agreement;

     NOW, THEREFORE, in consideration of the premises and for other good and
valuable consideration, the receipt and sufficiency of which is hereby
acknowledged, the parties hereto agree as follows:

     Section 1.  Amendments.   The terms of the Credit Agreement are hereby
     ---------   -----------
amended as follows:

     (a)    Definitions.  Section 1.1 of the Credit Agreement is amended by
            -----------
deleting therefrom the definitions of "Commitment" and "Commitment Share" and
adding thereto the following defined terms:

          "Commitment" means, with respect to each Bank, (i) the amount set
forth opposite the name of such Bank on the schedule below, and (ii) as to any
Bank which enters into any Assignment and Acceptance  (whether as transferor
Bank or as Assignee thereunder), the amount of such Bank's Commitment after
giving effect to such Assignment and Acceptance, in each case as such amount may
be reduced from time to time pursuant to Sections 2.07 and 2.08, and "Commitment
Share" means the percentage of the total Commitment set forth opposite the name
of such Bank on the schedule below, as such percentage may be adjusted from time
to time pursuant to Section 10.08(c):
<PAGE>

<TABLE>
<CAPTION>

Bank                                   Commitment        Commitment Share
----                                  ------------       -----------------
<S>                                   <C>                 <C>

Wachovia Bank, N.A.                   $ 33,750,000                15%

SunTrust Bank,
Chattanooga, N.A.                     $ 30,937,500             13.75%

NationsBank, N.A.                     $ 30,937,500             13.75%

BankBoston, N.A.                      $ 30,937,500             13.75%

AmSouth Bank                          $ 26,000,000             11.56%

Bank of America National
Trust & Savings Association           $ 17,437,500              7.75%

Chase Bank of Texas, National
Association,
f/k/a Texas Commerce Bank
National Association                  $ 17,437,500              7.75%

ABN-Amro Bank, N.A.                   $ 17,437,500              7.75%

First American National Bank          $ 11,687,500              5.19%

First Tennessee Bank, N.A.            $  8,437,500              3.75%

TOTAL COMMITMENT                      $225,000,000               100%

</TABLE>
     (b)  Representation and Warranty as to Year 2000 Compliance.  A new Section
          -------------------------------------------------------
5.19 is added to the Credit Agreement as follows:

          "Section 5.19.  Year 2000 Compliance.  The Borrower has (i) initiated
                          ---------------------
a review and assessment of all areas within its and each of its Subsidiaries'
business and operations (including those affected by suppliers and vendors) that
could be adversely affected by the "Year 2000 Problem" (that is, the risk that
computer applications used by the Borrower or any of its Subsidiaries (or its
suppliers and vendors) may be unable to recognize and perform properly date-
sensitive functions involving certain dates prior to and any date after December
31, 1999), (ii) developed a plan and timeline for addressing the Year 2000
Problem on a timely basis, and (iii) to date, implemented that plan in
accordance with that timetable.  The Borrower reasonably believes that all
computer applications (including those of its suppliers and vendors) that are
material to its or any of its Subsidiaries' business and operations will on a
timely basis be able to perform properly date-sensitive functions for all dates
before and after January 1, 2000 (that is,

                                       2
<PAGE>

be "Year 2000 compliant"), except to the extent that a failure to do so could
not reasonably be expected to have Material Adverse Effect."

     (c)  Limitation on Acquisitions.   Section 6.25(a) of the Credit Agreement
          ---------------------------
is deleted in its entirety and the following is substituted therefore:

          "(a) during calendar year 1998, the Borrower may acquire all of the
outstanding capital stock of Victory Express, Inc. and of PST Vans, Inc.,
provided that the acquisition of the capital stock of PST Vans, Inc. is on the
terms and conditions set forth in that certain Agreement and Plan of  Merger
dated as July 7, 1998, by and among PST Vans, Inc., U.S. Xpress Enterprises,
Inc., and PST Acquisition Corp., and further provided that for any Fiscal Year
thereafter the aggregate total consideration for all such acquisitions shall not
exceed $75,000,000."

     (d)  Covenant as to Year 2000 Compliance.  A new Section 6.27 is added to
          ------------------------------------
the Credit Agreement as follows:

          "Section 6.27.  Year 2000 Compliance.  The Borrower will promptly
                          --------------------
notify the Agent in the event the Borrower discovers or determines that any
computer application (including those of its suppliers and vendors) that is
material to its or any of its Subsidiaries' business and operations will not be
Year 2000 compliant on a timely basis, except to the extent that such failure
could not reasonably be expected to have a Material Adverse Effect."

     Section 2.  Replacement of Revolving Loan Notes.  The Revolving Loan Note
     ---------   ------------------------------------
previously delivered by the Borrower to each Lender shall be replaced by the
execution and delivery of an Amended Revolving Loan Note, in form and substance
as set forth on Exhibit A-1 hereto, which Amended Note shall reflect the
increased Commitment from each Lender to the Borrower.

     Section 3.  Conditions Precedent.  This First Amendment and the obligations
     ---------   ---------------------
of the Lenders evidenced hereunder shall not be effective until the
Administrative Agent shall have received each of the following documents, each
of which shall be satisfactory in form and substance to the Administrative
Agent:

          (a) The Amended Revolving Loan Notes complying with the terms of this
     Amendment, duly executed and delivered by the Borrower;

          (b) Certified copies of all necessary action taken by the Borrower to
     authorize the execution, delivery and performance of this Amendment and the
     Revolving Loan Notes;

          (c) Certificates of Incumbency and specimen signatures signed by the
     appropriate authenticating person with respect to each of the officers or
     other persons of the Borrower who are authorized to execute and deliver
     this Amendment and the Amended Revolving Loan Notes;

                                       3
<PAGE>

          (d) A Reaffirmation of Guaranty from each Subsidiary in substantially
     the form of Exhibit B-1 hereto;

          (e) A Certificate executed by the Chief Executive Officer or Chief
     Financial Officer of the Borrower stating that, to the best of his
     knowledge and based upon an examination sufficient to enable him to make an
     informed statement, (i) all of the representations and warranties made or
     deemed to be made under the Credit Agreement are materially true and
     correct as of the date of this First Amendment to Credit Agreement, and
     (ii) no Default or Event of Default exists;

          (f) A fully executed copy of the Agreement and Plan of Merger dated as
     July 7, 1998, by and among PST Vans, Inc., U.S. Xpress Enterprises, Inc.,
     and PST Acquisition Corp., certified by the Chief Executive Officer of the
     Borrower as being in full force and effect; and

          (g) The opinion of Miller & Martin, counsel to the Borrower, addressed
     to the Lenders and the Agents and in form and substance satisfactory to the
     Administrative Agent.

          Section 4.  Reference to and Effect on the Credit Agreement and
          ---------   ---------------------------------------------------
the Other Loan Documents.
-------------------------

          (a) On and after the date hereof, each reference in the Credit
Agreement to "this Agreement," "hereunder," "hereof," "herein" or words of like
import referring to the Credit Agreement, and each reference in the other Loan
Documents to the "Credit Agreement," "thereunder," "thereof" or words of like
import referring to the Credit Agreement shall mean and be a reference to the
Credit Agreement as amended hereby.

          (b) Except as specifically amended by this Amendment, the Credit
Agreement and the other Loan Documents shall remain in full force and effect and
are hereby ratified and confirmed.

          (c)  The execution, delivery and performance of this Amendment shall
not, except as expressly provided herein, constitute a waiver of any provision
of, or operate as a waiver of any right, power or remedy of the Administrative
Agent or any Lender under the Credit Agreement or any of the other Loan
Documents.

     Section 5.  Miscellaneous.
     ----------  --------------

          (a)  Section and Subsection Headings.   Section and Subsection
               --------------------------------
headings in this Amendment are included herein for convenience of reference only
and shall not constitute a part of this Amendment for any other purpose or be
given any substantive effect.

          (b)  Governing Law. This Amendment and the rights and obligations of
               --------------
the parties hereunder shall be governed by, and shall be construed and enforced
in accordance with, the laws of the State of Georgia.

                                       4
<PAGE>

          (c)  Counterparts; Effectiveness.  This Amendment may be executed in
               ----------------------------
any number of counterparts and by different parties hereto and separate
counterparts, each of which when so executed and delivered shall be deemed an
original, but all such counterparts taken together shall constitute but one and
the same instrument; signature pages may be detached from multiple separate
counterparts and attached to a single counterpart so that all signature pages
are physically attached to the same document.  This Amendment shall become
effective upon the execution of a counterpart hereof by the Borrower and the
Required Lenders and receipt by the Borrower and the Administrative Agent of
written or telephonic notification of such execution and authorization or
delivery thereof.

     IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be
duly executed and delivered by their respective officers thereunto duly
authorized as of the date first above written.

                                 U.S. XPRESS ENTERPRISES, INC.

                                 By:
                                     --------------------------------------
                                 Title:

                                 WACHOVIA BANK, N.A.,
                                 as Lender and Administrative Agent

                                 By:
                                     --------------------------------------
                                 Title:

                                 By:
                                     --------------------------------------
                                 Title:

                                 NATIONSBANK, N.A.,
                                 as Lender and Syndication Agent

                                 By:
                                     --------------------------------------
                                 Title:

                                       5
<PAGE>

                                 BANKBOSTON, N.A.,
                                 as Lender and Documentation Agent

                                 By:
                                     --------------------------------------
                                 Title:

                                 By:
                                     --------------------------------------
                                 Title:

                                 SUNTRUST BANK, CHATTANOOGA, N.A.
                                 as Lender and Co-Agent

                                 By:
                                     --------------------------------------
                                 Title:

                                 AMSOUTH BANK

                                 By:
                                     --------------------------------------
                                 Title:

                                 CHASE BANK OF TEXAS, NATIONAL ASSOCIATION
                                 f/k/a Texas Commerce Bank National
                                 Association

                                 By:
                                     --------------------------------------
                                 Title:

                                 BANK OF AMERICA NATIONAL
                                 TRUST & SAVINGS ASSOCIATION

                                 By:
                                     --------------------------------------
                                 Title:

                                       6
<PAGE>

                                 ABN-AMRO BANK, N.A.

                                 By:
                                     --------------------------------------
                                 Title:

                                 FIRST AMERICAN NATIONAL BANK

                                 By:
                                     --------------------------------------
                                 Title:

                                 FIRST TENNESSEE BANK, N.A.

                                 By:
                                     --------------------------------------
                                 Title:

                   [Final signature page to First Amendment]

                                       7

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