Document:

<PAGE>
                                                                    EXHIBIT 10.2

                               SECOND AMENDMENT TO
                               SEVERANCE AGREEMENT

         WHEREAS, Ocean Energy, Inc. ("OEI") and James T. Hackett ("Executive")
have heretofore entered into a Severance Agreement (the "Agreement"), initially
effective as of August 25, 1998; and

         WHEREAS, the Agreement has been subsequently amended, and OEI, Devon
Energy Corporation ("Devon") and Executive desire to further amend the Agreement
in certain respects, contingent on, and effective upon, the consummation of the
transactions (the "Merger") contemplated by the Agreement and Plan of Merger by
and among Devon, Devon Newco Corporation, and OEI dated as of February 23, 2003,
as the same may be amended from time to time (the "Merger Agreement");

         NOW, THEREFORE, the Agreement is amended as follows, effective as of
the "Effective Time" (which, for purposes of this Amendment, shall have the
meaning ascribed to it in the Merger Agreement):

         1. References to the "Company" in the Agreement shall mean Devon Energy
         Corporation.

         2. Clauses (i), (ii) and (iv) of Section 1(a) of the Agreement shall be
         amended to read as follows:

                  "(i) Executive is assigned any duties as the President and
                  Chief Operating Officer of the Company that are significantly
                  less than or below the duties generally associated with such
                  positions in a comparable company;"

                  (ii) the sum of Executive's annual base salary and bonus for
                  2003 or 2004 is less than the average of the total base salary
                  and bonus paid to Executive in 2001 and 2002;

                                     . . . .

                  (iv) Executive's principal place of employment is changed to a
                  location other than the principal executive offices of the
                  Company or such Company offices are changed to a location
                  other than the greater Oklahoma City area."

         3. The Company agrees that the Merger constitutes a Change of Control
         for purposes of this Agreement, as hereby amended, and the two-year
         termination "protected" period provided in Section 3 with respect to
         such Change of Control shall begin on the Effective Time.

<PAGE>

         4. As amended hereby, the Agreement is specifically ratified and
         reaffirmed. If the Merger Agreement is terminated without the
         consummation of the transactions contemplated thereby, this Amendment
         shall be null and void and of no effect.

                                      -2-
<PAGE>
         IN WITNESS WHEREOF, the parties hereto have executed this Amendment on
this February 23, 2003, to be effective as of the Effective Time.

                                      Ocean Energy, Inc.

                                      By:  /s/ ROBERT K. REEVES
                                           -------------------------------------
                                           Name:   Robert K. Reeves
                                           Title:  Executive Vice President,
                                                   General Counsel and Secretary

                                      Devon Energy Corporation

                                      By:  /s/ J. LARRY NICHOLS
                                           -------------------------------------
                                           Name:   J. Larry Nichols
                                           Title:  Chairman, President and
                                                   Chief Executive Officer

                                      James T. Hackett

                                      /s/ JAMES T. HACKETT
                                      ------------------------------------------
                                      James T. Hackett<PAGE>

                                                                    EXHIBIT 4.20

                       FIRST UNION COMMERCIAL CORPORATION

                                 USA TRUCK, INC.

October 31, 2002

Mr. Cliff Beckham
Chief Financial Officer
USA Truck, Inc.
3200 Industrial Park Road
Van Buren, Arkansas 72956

Dear Mr. Beckham:

We are pleased to present our proposal for lease of equipment from First Union
Commercial Corporation. The enclosed proposal exhibit contains additional
information regarding this proposal and is incorporated herein by reference. If
the terms are mutually satisfactory, they will be incorporated in an Equipment
Lease agreement which will be executed by the parties.

The lease proposal is as follows:

1.       LESSEE: USA Truck.

2.       LESSOR: First Union Commercial Corporation or its nominee.

3.       EQUIPMENT, LEASE TERM AND LEASE PAYMENT: See attached exhibit(s).

4.       TYPE OF LEASE: The lease will be a net lease whereby Lessee will be
         responsible for all expenses related directly or indirectly to the use
         of the equipment including maintenance, taxes, insurance coverage, etc.

Should this proposal be acceptable in principle, please sign and date the
enclosed original of this letter and return it to us as an indication of your
acceptance, by the expiration date noted below. As is our standard practice,
this proposal is subject to final approval by our Pricing and Credit Committees
and, as such, should not be deemed to be a commitment on the part of First
Union.

<PAGE>

We appreciate the opportunity to present this proposal and look forward to your
favorable acknowledgement of this letter. In the meantime, we would be pleased
to receive any questions or comments that you may have.

Sincerely,

FIRST UNION COMMERCIAL CORPORATION

Jody Roberts
Director

                            ACCEPTED PROPOSAL EXHIBIT NO.

                            USA TRUCK
                            -----------------------------------
                                          (Seal)
                            By:      Cliff Beckham
                               --------------------------------

                                           C.F.O.
                            -----------------------------------
                                          Title
                            Date:  November 5, 2002
                                 ------------------------------

THIS PROPOSAL SHALL EXPIRE ON NOVEMBER 30, 2002 UNLESS ACCEPTED BY LESSEE PRIOR
TO THAT DATE.

                                       2<PAGE>

                                                                    EXHIBIT 4.21

           FIRST UNION COMMERCIAL CORPORATION PROPOSAL EXHIBIT (NO. 1)

                                 USA TRUCK, INC.

                            PROPOSAL EXHIBIT (NO. 1)

The terms of this Proposal Exhibit are incorporated by reference within the
Proposal letter dated October 31, 2002.

1.       TYPE OF EQUIPMENT: New 400 Class Eight Sleeper Tractors.

2.       ANTICIPATED EQUIPMENT COST: Approximately $5,000,000.00.

3.       EQUIPMENT LOCATION: Continental United States.

4.       ANTICIPATED DELIVERY DATE: January 15th through December 15th, 2003.

5.       LEASE TERM: Forty-two (42) months.

6.       LEASE PAYMENTS: Lessee shall make forty-two (42) monthly payments, each
         payable in arrears, with the following monthly payment factors
         according to the month of equipment takedown:

<Table>
<Caption>
Month          JAN       FEB       MAR       APR       MAY      JUNE      JULY       AUG      SEPT       OCT       NOV       DEC
             -------   -------   -------   -------   -------   -------   -------   -------   -------   -------   -------   -------
<S>          <C>       <C>       <C>       <C>       <C>       <C>       <C>       <C>       <C>       <C>       <C>       <C>
Lease Rate      2.99%     2.97%     2.94%     2.91%     2.91%     2.89%     2.67%     2.64%     2.60%     2.61%     2.57%     2.54%

Payment
Factor       1.60616   1.60462   1.60307   1.60151   1.60150   1.60000   1.58687   1.58486   1.58285   1.58307   1.58112   1.57917
</Table>

         The lease rate in this transaction will float from the date of this
         letter until the equipment funding date, based on the change in either
         the 7 -1/2% Treasury Note's yield to maturity of 1.90% with a three (3)
         year remaining life and maturing February, 2005 or the one year LIBOR
         rate of 1.67%, as published in the October 31, 2002 edition of The Wall
         Street Journal and as published on the equipment funding date. The
         lease rate in this transaction will float up from the date of this
         proposal until the equipment funding date based on the change in either
         the above referenced Treasury Note's yield to maturity or the one year
         LIBOR rate, whichever is greater. The lease rate in this transaction
         will float down from the date of this proposal until the equipment
         funding date based on the change in either the above referenced
         Treasury Note's yield to maturity or the one year LIBOR rate, whichever
         is less. The lease rate shall be adjusted by .01% for each
         corresponding increase or decrease of .01% in the selected index. Due
         to the extended nature of the fundings quoted in this proposal, Lessor
         reserves the right to adjust the lease rate and payment factor in order
         to preserve its economic yield.

7.       PURCHASE OPTION: At the end of the lease term, Lessee shall have the
         option to purchase the equipment for its then Fair Market Value.

8.       TERMINAL RENTAL ADJUSTMENT CLAUSE: If the fair market value paid to
         Lessor by the Lessee or a third party exceeds or falls below forty
         percent (40%) of original equipment cost, the excess will be refunded
         to Lessee or the shortfall will be reimbursed to Lessor by Lessee
         through a rental adjustment.

9.       DEPRECIATION: For the account of the LESSOR and assumed to be three (3)
         year MACRS property.

10.      EXPENSES: Lessee shall bear expenses related to (i) preparation,
         negotiation and the finalization of documents related to the
         transaction, (ii) out-of-pocket expenses for lien searches, title
         searches and obtaining certified copies of charter documents and good
         standing certificates, (iii) title application, lien application and
         registration fees and financing statement filing fees, and (iv) similar
         out-of-pocket expenses.

11       INDEMNIFICATION: Lessee shall indemnify Lessor against all hazards,
         liabilities, claims, actions, contingencies and risk of loss caused by
         the acts and omissions of Lessee. Additionally, Lessee shall indemnify
         Lessor against the loss of tax benefits retained by Lessor caused by
         the acts and omissions of Lessee.

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