Document:

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                                                                    Exhibit 10.8

                                March 29, 2000

United Road Services, Inc.
17 Computer Drive West
Albany, New York 12205

re:  Fourth Amendment and Waiver

Ladies/Gentlemen:

     Please refer to the Amended and Restated Credit Agreement dated as of
November 2, 1998 (as amended or supplemented, the "Credit Agreement") among
United Road Services, Inc. (the "Company"), various financial institutions and
Bank of America, N.A. (f/k/a Bank of America National Trust and Savings
Association), as Agent.  Capitalized terms used but not otherwise defined herein
have the meanings assigned thereto in the Credit Agreement.

     The Required Banks hereby waive through April 28, 2000 the Company's non-
compliance with Sections 10.6.1, 10.6.3 and 10.6.5 of the Credit Agreement.

     The Company and the Required Banks hereby agree to amend Section 12.1.11 by
deleting the words "common stock" in clause (a) and inserting "any class of
stock" therefor.  In consideration of the foregoing waiver, the Company (i)
acknowledges that upon the expiration of such waiver (unless a new waiver or an
amendment has been agreed to by the Required Banks) an immediate Event of
Default shall exist under the Credit Agreement and (ii) agrees that, unless the
Required Banks otherwise consent, the aggregate outstanding principal amount of
all Loans plus the Stated Amount of all Letters of Credit shall not at any time
exceed $55,000,000.

     This letter is limited to the matters specifically set forth herein and
shall not be deemed to constitute a waiver, consent or amendment with respect to
any other matter whatsoever.

     This letter shall become effective upon receipt by the Agent of
counterparts hereof (or facsimiles thereof) executed by the Company and the
Required Banks.

<PAGE>

                                     UNITED ROAD SERVICES, INC.

                                     By:  /s/ Gerald R. Riordan
                                          ---------------------
                                     Title:  Chief Executive Officer
                                             -----------------------

                                     BANK OF AMERICA, N.A., as Agent

                                     By:  /s/ Kristine D. Hyde
                                          --------------------
                                     Title:  Assistant Vice President
                                             -----------------------

                                     BANK OF AMERICA, N.A., as a Bank

                                     By:  /s/ Paul R. Frey
                                          ----------------
                                     Title:  Senior Vice President
                                             ---------------------

                                     FLEET NATIONAL BANK, as a Bank

                                     By:  /s/ Lindsay W. McSweeney
                                          ------------------------
                                     Title:  Director
                                             --------

                                     COMERICA BANK, as a Bank

                                     By:  /s/ Preeti Sarnaik
                                          ------------------
                                     Title:  Account Officer
                                             ---------------<PAGE>

                                                                    Exhibit 10.9

                                             as of April 12, 2000

United Road Services, Inc.
17 Computer Drive West
Albany, New York 12205

Ladies and Gentlemen:

     Please refer to the Amended and Restated Credit Agreement dated as of
November 2, 1998 (as amended or supplemented, the "Credit Agreement") among
United Road Services, Inc. (the "Company"), various financial institutions and
Bank of America, N.A. (f/k/a Bank of America National Trust and Savings
Association), as Agent.  Capitalized terms used but not otherwise defined herein
have the meanings assigned thereto in the Credit Agreement.

     The Required Banks hereby waive (i) the Company's failure to deliver the
financial statements required by Section 10.1.1 of the Credit Agreement within
90 days after the close of the Fiscal Year ended December 31, 1999 so long as
                                                                   -- ---- --
such financial statements are delivered on or before April 17, 2000; and (ii)
the Company's non-compliance with Section 10.6.7 for the month ending December
31, 1999.

     This letter is limited to the matters specifically set forth herein and
shall not be deemed to constitute a waiver, consent or amendment with respect to
any other matter whatsoever.

     This letter shall become effective upon receipt by the Agent of
counterparts hereof (or facsimiles thereof) executed by the Company and the
Required Banks.
<PAGE>

                                             BANK OF AMERICA, N.A., as Agent

                                             By:  /s/ Kristine D. Hyde
                                                  --------------------
                                             Title:  Assistant Vice President
                                                     ------------------------

                                             BANK OF AMERICA, N.A., as a Bank

                                             By:  /s/ Jennifer L. Gerdes
                                                  ----------------------
                                             Title:  Vice President
                                                     --------------

                                             COMERICA BANK, as a Bank

                                             By:  /s/ Preeti Sarnaik
                                                  ------------------
                                             Title:  Account Officer
                                                     ---------------

                                             FLEET NATIONAL BANK, as a Bank

                                             By:  /s/ Lindsay W. McSweeney
                                                  ------------------------
                                             Title:  Director
                                                     --------

                                             THE CHASE MANHATTAN BANK, as a Bank

                                             By:  /s/ Thomas J. Chera
                                                  -------------------
                                             Title:  Vice President
                                                     --------------<PAGE>

                                                                   Exhibit 10.11

                                             April 27, 2000

United Road Services, Inc.
17 Computer Drive West
Albany, New York 12205

re:  Waiver Letter

Ladies/Gentlemen:

     Please refer to the Amended and Restated Credit Agreement dated as of
November 2, 1998 (as amended or supplemented, the "Credit Agreement") among
United Road Services, Inc. (the "Company"), various financial institutions and
Bank of America, N.A. (f/k/a Bank of America National Trust and Savings
Association), as Agent.  Capitalized terms used but not otherwise defined herein
have the meanings assigned thereto in the Credit Agreement.

     The Required Banks hereby waive through May 31, 2000 the Company's non-
compliance with Sections 10.6.1, 10.6.3 and 10.6.5 of the Credit Agreement.  In
consideration of the foregoing waiver, the Company (i) acknowledges that upon
the expiration of such waiver (unless a new waiver or an amendment has been
agreed to by the Required Banks) an immediate Event of Default shall exist under
the Credit Agreement and (ii) agrees that, unless the Required Banks otherwise
consent, the aggregate outstanding principal amount of all Loans plus the Stated
Amount of all Letters of Credit shall not at any time exceed $55,000,000.

     The Required Banks hereby permanently waive the Company's non-compliance
with Section 10.6.7 of the Credit Agreement or any period prior to January 31,
2000.

     The Required Banks hereby agree that for the purposes of calculating EBITDA
for the month ending March 31, 1999, an amount equal to the lesser of (i) the
loss incurred by the Company on the sale of the capital stock of Northshore
Towing, Inc., North Shore Recycling, Inc. and Evanston Reliable Maintenance,
Inc. or (ii) $212,000 shall be added back to EBITDA (to the extent deducted in
determining EBITDA for such month).

     This letter is limited to the matters specifically set forth herein and
shall not be deemed to constitute a waiver, consent or amendment with respect to
any other matter whatsoever.

     This letter shall become effective upon receipt by the Agent of
counterparts hereof (or facsimiles thereof) executed by the Company and the
Required Banks.
<PAGE>

                                     BANK OF AMERICA, N.A., as Agent

                                     By:  /s/ Kristine D. Hyde
                                          --------------------
                                     Title:  Assistant Vice President
                                             ------------------------

                                     BANK OF AMERICA, N.A., as a Bank

                                     By:  /s/ Paul R. Frey
                                          ----------------
                                     Title:  Senior Vice President
                                             ---------------------

                                     COMERICA BANK, as a Bank

                                     By:  /s/ Preeti Sarnaik
                                          ------------------
                                     Title:  Account Officer
                                             ---------------

                                     FLEET NATIONAL BANK, as a Bank

                                     By:  /s/ Lindsay W. McSweeney
                                          ------------------------
                                     Title:  Director
                                             --------

                                     THE CHASE MANHATTAN BANK, as a Bank

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

Acknowledged and Agreed
as of the date first written above:

UNITED ROAD SERVICES, INC.

By:  /s/ Gerald R. Riordan
     ---------------------
Title:  Chief Executive Officer
        -----------------------

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