TENTH AMENDMENT TO REVOLVING
                                 LOAN AGREEMENT


         This Tenth  Amendment to Revolving Loan Agreement (the  "Amendment") is
entered into as of the 31st day of  December,  1997,  between PST Vans,  Inc., a
Utah corporation (the "Borrower") and The Bank of New York (the "Bank").

RECITALS:

         A.  Borrower  and Bank  entered into a Revolving  Loan  Agreement  with
Letter  of  Credit  Facility  (the  "Loan  Agreement")  dated  March 7, 1994 (as
amended).  In connection  with the Loan Agreement,  Borrower made,  executed and
delivered  to Bank a Revolving  Promissory  Note,  dated  March 7, 1994,  in the
principal  amount of $9,500,000  (the "Note").  Also in connection with the Loan
Agreement,  and as security for payment of Borrower's obligations under the Note
and Loan  Agreement,  Borrower  executed a  Security  Agreement  (the  "Security
Agreement")  dated March 7, 1994,  wherein  Borrower  granted to Bank a security
interest in the Collateral, as defined in the Security Agreement. The Note, Loan
Agreement,  Security  Agreement and all other documents executed by Borrower and
Bank in connection with the Loan Agreement,  including the prior nine amendments
to the Loan Agreement,  are hereafter  sometimes referred to collectively as the
"Loan Documents".

         B.  Borrower  has  requested  that  Bank  modify  the terms of the Loan
Agreement,  as  modified,  including  the  Ninth  Amendment  To  Revolving  Loan
Agreement, with respect to the Termination Date under the Loan Agreement.

         C. Since  March 1,  1998,  Bank has  incurred  and is  incurring  legal
expenses  and  costs  in the  amount  of  $900.00  in  connection  with the Loan
Documents and negotiating and documenting this Tenth Amendment.

         D. Bank is  willing to modify  the terms of the Loan  Documents  on the
terms and conditions stated herein.

         NOW  THEREFORE,  in  consideration  of the foregoing and other good and
valuable  consideration,   the  receipt  and  sufficiency  of  which  is  hereby
acknowledged, Borrower and Bank agree as follows:



<PAGE>


         1.  Termination  Date.  The  Termination  Date under the Loan Agreement
shall be May 15,  1998  (unless  termination  occurs  under  Section  8.2 of the
Agreement), and all remaining letters of credit must be terminated no later than
that date. If on the Termination  Date, there are undrawn letters of credit that
remain outstanding,  Borrower must (i) deposit in an account with the Bank (with
Borrower having no right to withdraw the funds), an amount at least equal to one
hundred and five percent (105%) of the amount of all such outstanding letters of
credit,   which  account  shall  be  held   exclusively   as  security  for  the
reimbursement  obligations  associated  with those  letters  of credit,  or (ii)
deliver an unconditional  letter or letters of credit, each in a form acceptable
to the Bank and each issued by an institution  acceptable to the Bank that total
one hundred and five percent (105%) of the amount of all the outstanding letters
of credit  issued by the Bank for the account of Borrower,  which shall serve to
ensure  payment of the  reimbursement  obligations  of Borrower to the Bank.  An
undrawn letter of credit shall be deemed to remain  outstanding if the letter of
credit has not expired and has not been returned by the beneficiary  accompanied
by a letter  from the  beneficiary  stating  that  Bank is  released  and has no
further obligations under the letter of credit.

         2.  Extension  Fees.  In addition to other  charges,  fees and payments
payable under the Loan  Agreement,  Borrower  shall pay to the Bank on or before
April 3,  1998 an  extension  fee of  $25,000.00,  and if the  letter  of credit
remains  outstanding as of the following  dates shall pay  additional  extension
fees of  $15,000.00  each on April  17,  1998,  May 1,  1998  and May 15,  1998,
respectively.

         3. Payment of  Attorneys'  Fees and Costs.  Contemporaneously  with the
delivery  of this Tenth  Amendment,  Borrower  shall  deliver to Ray,  Quinney &
Nebeker a payment in the form of a check or draft made payable to Ray, Quinney &
Nebeker in the amount of $900.00.

         4. No Obligation to Enter into Additional  Amendments.  Borrower agrees
and acknowledges  that this Tenth Amendment,  together with all prior Amendments
entered into between Borrower and Bank,  shall create no further  obligations on
Bank to enter into any additional amendments in the future.

         5.   Affirmation   of  Security   Interest.   Borrower   reaffirms  and
acknowledges the security  interests  heretofore granted to Bank in the Security
Agreement and any prior Amendments to the Revolving Loan Agreement.

         6. Incorporation by Reference.  The entire Loan Agreement and any prior
written  amendments  (the "Prior  Amendments")  are hereby  incorporated by this
reference into this Amendment as if those  agreements  were fully set out in the
text of this Amendment,  subject however,  to the  modifications  and amendments
which are herein set forth.  Accordingly,  all  defined  terms found in the Loan
Agreement and the Prior Amendments shall have the same meaning herein (including
in the recitals above), except to the extent that amendments to such definitions
are made in this Amendment.

         7. Borrower  Acknowledgments  and Waivers.  Borrower hereby represents,
warrants,  acknowledges and agrees that, as of the date hereof: (a) Borrower has
no offsets, counterclaims or other claims of damage or liability against Bank or
defenses to payments due under the  Obligations,  and  Borrower,  in all events,
hereby knowingly and intentionally  waives,  relinquishes and releases the right
to  assert  or claim  any of the  foregoing;  (b) Bank is not nor has it been in
breach or default of any of the duties or  obligations  of Bank under any of the
Loan  Documents,  and Borrower fully and knowingly  hereby waives,  releases and
relinquishes  the right to make any claim for the same;  (c) the  execution  and
performance  of  this  Amendment  have  been  duly  authorized  pursuant  to all
necessary  corporate  authority;  and (d) the  recitals  set forth above in this
Amendment are true. Borrower further reaffirms its obligations hereunder and all
of the  Obligations,  as modified  hereby.  Except as specifically and expressly
provided in writing  signed by the Bank,  neither this  Amendment nor any action
taken in  accordance  herewith  shall  constitute  a  release  or  waiver of any
obligation or liability of Borrower under the Loan Documents, including the Loan
Agreement or the Note.


<PAGE>



         8. Integration.  The incorporation herein of the Loan Agreement and the
Prior  Amendments  accomplishes  a full  integration  of the  agreements  of the
Borrower  and  Bank and the  Loan  Agreement  shall  now be the  integrated  and
coordinated compilation of the original Loan Agreement, the Prior Amendments and
this Amendment and is the final and definitive  written expression and agreement
of the parties with respect to the subject  matter  thereof.  All prior writings
and notes are  superseded by this  integrated  agreement,  provided that nothing
herein is meant to  abrogate,  except to the  extent  specifically  modified  or
amended  hereby,  the  Note,  the  Loan  Agreement,  or any of  the  other  Loan
Documents.  No prior oral understanding or agreement  contradictory to the terms
of this  Amendment  and the  integrated  Loan  Agreement  survives the execution
hereof.

         9. Further Assurances. Borrower agrees to take or cause to be taken all
such other  actions as shall be reasonably  required by Bank in connection  with
and in perfection or  continuation of the rights of the Bank with respect to the
Obligations.  Borrower  shall also  execute or cause to be  executed  such other
documents,   papers,  instruments  and  agreements  which  are  deemed,  in  the
reasonable  judgment  of the Bank,  to be  necessary  to  complete,  perfect  or
otherwise  finalize  the  agreements  and  arrangements   contemplated  by  this
Amendment.

         10. Counterparts.  This Tenth Amendment to Revolving Loan Agreement may
be  signed  in any  number  of  counterparts,  each of which  shall be deemed an
original,  and such  counterparts  together  shall  constitute  one and the same
agreement.

         IN WITNESS  WHEREOF the parties hereto have caused this Tenth Amendment
to be executed as of the date first written above.

BORROWER:                                            THE BANK:

PST VANS, INC.                                       THE BANK OF NEW YORK


By:                                 By:
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Its:                                Its:
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