Exhibit 10.1

AMENDMENT NO. 1 TO NOTE

This Amendment No. 1 to Note (“ Amendment ”), is made, delivered, and effective as of August 10, 2012 by and between MANITEX LIFTKING, ULC , an Alberta corporation (“ Borrower ”) and Comerica Bank , a Texas banking association (“ Bank ”) in order to amend the US$6,500,000.00 Amended and Restated Master Revolving Note (Multi-Currency) dated December 23, 2011, made by Borrower to Bank (“ Note ”).

For valuable consideration, Borrower and Bank agree as follows:

1. The Note is amended as follows:

(a) Effective August 10, 2012, the face amount of the Note is increased from US$6,500,000.00 to $8,000,000.00.

(b) Borrower shall pay to Bank an unused commitment fee equal to 0.125% multiplied by the daily average balance by which the face amount of the Note exceeded the aggregate amount of outstanding Advances (“Unused Fee”). The Unused Fee shall be payable in arrears on the first Business day of each fiscal quarter of Borrower, for the quarter most recently ended. The Unused Fee shall be calculated on the basis of a 360 day year, and assessed for the actual number of days elapsed in the period of calculation thereof.

2. This Amendment is not an agreement to any further or other amendment of the Note. Borrower expressly acknowledges and agrees that except as expressly amended in this Amendment, the Note, as amended, remains in full force and effect and is ratified and confirmed. The execution of this Amendment shall not be deemed to be a waiver of any Default or Event of Default.

3. All the terms used in this Amendment which are defined in the Note shall have the same meaning as used in the Note, unless otherwise defined in this Amendment.

4. Borrower waives, discharges, and forever releases Bank, Bank’s employees, officers, directors, attorneys, stockholders, and their successors and assigns, from and of any and all claims, causes of action, allegations or assertions that Borrower has or may have had at any time up through and including the date of this Amendment, against any or all of the foregoing, regardless of whether any such claims, causes of action, allegations or assertions are known to Borrower or whether any such claims, causes of action, allegations or assertions arose as result of Bank’s actions or omissions in connection with the Note, or any amendments, extensions or modifications thereto, or Bank’s administration of the debt governed by the Note or otherwise.

5. Borrower is responsible for all costs incurred by Bank, including without limit reasonable attorney fees, with regard to the preparation and execution of this Amendment.

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This Amendment No. 1 to Note is executed and delivered as of the Effective Date.

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Exhibit 10.2

FIRST AMENDMENT TO ADVANCE FORMULA AGREEMENT

This First Amendment to restated Advance Formula Agreement (this “Amendment”) is entered into as of this 10 ^th day of August, 2012, by and between COMERICA BANK (“ Bank ”), a Texas banking association and an authorized foreign bank under the Bank Act (Canada), and MANITEX LIFTKING, ULC , an Alberta corporation (“ Debtor ”).

Recitals:

A. Debtor executed and delivered to Bank that certain restated Advance Formula Agreement dated on or about December 23, 2011 (the “Advance Formula Agreement”).

B. Debtor and Bank desire to amend the Advance Formula Agreement upon the following terms and conditions.

NOW THEREFORE , for good and valuable consideration, Bank and Debtor agree as follows:

1. DEFINITIONS

1.1. Capitalized terms used herein and not defined to the contrary have the meanings given them in the Advance Formula Agreement.

2. AMENDMENT TO ADVANCE FORMULA AGREEMENT

in each case less customary exclusions and reserves (the “Advance Formula”).

“(i) it is not owing by an Account Debtor which (i) does not maintain its chief executive office in the United States of America or Canada, (ii) is not organized under the laws of the

United States of America or Canada, or any state or province thereof, as applicable, or (iii) is the government of any foreign country or sovereign state, or of any state, province, municipality or other instrumentality or agency thereof; provided, however, Accounts owing by Canadian Commercial Corporation, a Crown corporation of the Government of Canada (“CCC”), Canadian Department of National Defence, a department of the Government of Canada (“Department of Defence”), the US State Department – GSO, the USA CE Finance Center and the United Nations, are included as Eligible Accounts;

(j) it is not an Account owing by the United States of America or Canada or any state, province or political subdivision thereof, or by any department, agency, public body corporate or other instrumentality or agency of any of the foregoing, unless all necessary steps are taken to comply with the Federal Assignment of Claims Act of 1940, as amended, the Financial Administration Act (Canada), as amended or with any comparable state or provincial law, as applicable, and all other necessary steps are taken to perfect Bank’s security interest in such Account; provided, however, Accounts owing by CCC, Department of Defence, the US State Department – GSO, the USA CE Finance Center and the United Nations, are included as Eligible Accounts;”

“ ‘ Work-In-Process Inventory Cap ’ shall mean Six Hundred Twenty Five Thousand Canadian Dollars ($625,000).”

3. REPRESENTATIONS

Debtor hereby represents and warrants that:

3.1. Execution, delivery and performance of this Amendment and any other documents and instruments required under this Amendment or the Advance Formula Agreement are within Debtor’s powers, have been duly authorized, are not in contravention of law or the terms of Debtor’s by-laws, and do not require the consent or approval of any governmental body, agency, or authority.

3.2. This Amendment and the Advance Formula Agreement, as amended by this Amendment, and any other documents and instruments (“Documents”) required under this Amendment or the Advance Formula Agreement, when issued and delivered under this Amendment or the Advance Formula Agreement, will be valid and binding in accordance with their terms.

3.3. To the knowledge of Debtor, except as previously disclosed to Bank in writing, no Default or Event of Default (as such terms are defined under the letter agreement by and between Bank and Debtor dated December 23, 2011 (“Letter Agreement”) and Loan Documents (as such term is defined in the Letter Agreement), or condition or event which, with the giving of notice or the running of time, or both, would constitute a Default or Event of Default under the Letter Agreement or Loan Documents, has occurred and is continuing as of the date hereof.

4. MISCELLANEOUS

4.1. This Amendment may be executed in as many counterparts as Bank and Debtor deem convenient, and shall be deemed to have become effective upon delivery to Bank of all counterparts hereof, executed by Debtor and Bank.

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4.2. Debtor and Bank acknowledge and agree that, except as specifically amended and/or waived herein and hereby, all of the terms and conditions of the Advance Formula Agreement remain in full force and effect in accordance with their original terms.

4.3. Debtor shall pay all of Bank’s legal costs and expenses (including legal fees and expenses) incurred in the negotiation, preparation and closing hereof.

4.4. Except as specifically set forth herein, nothing in this Amendment shall constitute, or be interpreted or construed to constitute, a waiver of any right or remedy of Bank, or of any Default or Event of Default under the Letter Agreement or Loan Documents whether now existing or hereafter arising and whether now known or hereafter discovered by or disclosed to Bank.

4.5. Bank expressly reserves the right to exercise any or all rights and remedies provided under the Loan Documents and Documents and applicable law except as modified herein. Bank’s failure to immediately exercise such rights and remedies shall not be construed as a waiver or modification of those rights or an offer of forbearance.

[signatures on following page]

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IN WITNESS WHEREOF, this Amendment to Advance Formula Agreement has been executed as of the day first stated above.

Accepted and Approved:

COMERICA BANK

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Exhibit 10.3

RECERTIFICATION OF AUTHORITY

The undersigned Secretary of Manitex Liftking, ULC, a corporation incorporated uner the provincial laws of Alberta (“Company”) hereby certifies to Comerica Bank, a Texas banking association (“Bank”) that the Company’s (i) Articles of Incorporation and Bylaws, and (ii) Corporate Resolutions and Incumbency Certification dated December 23, 2011, each previously delivered to Bank: (x) remain in full force and effect, (y) have not been amended, rescinded or repealed in any respect, and (z) may continue to be relied upon by Bank until express written notice to the contrary is delivered to Bank.

Dated: August 10, 2012

Exhibit 10.4

REAFFIRMATION OF GUARANTY

This Reaffirmation of Guaranty is made by the undersigned in favor of COMERICA BANK, a Texas banking association (“Bank”). The undersigned acknowledges that MANITEX LIFTKING, ULC, a corporation incorporated under the provincial laws of Alberta (“Borrower”) and Bank have executed that certain Amendment No. 1 to Note dated August 10, 2012 (“Amendment”), which amends that certain US$6,500,000.00 Amended and Restated Master Revolving Note dated December 23, 2011 by Borrower payable to Bank (as amended, the “Revolving Note”) to increase the face amount of the Revolving Note to US$8,000,000.

The undersigned consents to Borrower’s execution of the Amendment, ratifies its obligations under its Guaranty dated December 23, 2011 executed and delivered to Bank (“Guaranty”), confirms that the Guaranty remains in full force and effect with respect to the Revolving Note, as amended by the Amendment, and certifies that it does not have any defense or setoff to its obligations under the Guaranty.

The undersigned certifies to Bank that its (i) Articles of Incorporation and Bylaws, and (ii) Corporate Resolutions and Incumbency Certification (Authority to Support Another’s Borrowings) dated December 23, 2011, each previously delivered to Bank: (x) remain in full force and effect, (y) have not been amended, rescinded or repealed in any respect, and (z) may continue to be relied upon by Bank until express written notice to the contrary is delivered to Bank.

Execution of this Reaffirmation does not amend or modify any of the terms and conditions of the Guaranty, and Bank may continue to rely thereon without qualification.

Dated: August 10, 2012

Exhibit 10.5

REAFFIRMATION OF GUARANTY

This Reaffirmation of Guaranty is made by the undersigned in favor of COMERICA BANK, a Texas banking association (“Bank”). The undersigned acknowledges that MANITEX LIFTKING, ULC, a corporation incorporated under the provincial laws of Alberta (“Borrower”) and Bank have executed that certain Amendment No. 1 to Note dated August 10, 2012 (“Amendment”), which amends that certain US$6,500,000.00 Amended and Restated Master Revolving Note dated December 23, 2011 by Borrower payable to Bank (as amended, the “Revolving Note”) to increase the face amount of the Revolving Note to US$8,000,000.

The undersigned consents to Borrower’s execution of the Amendment, ratifies its obligations under its Guaranty dated December 23, 2011 executed and delivered to Bank (“Guaranty”), confirms that the Guaranty remains in full force and effect with respect to the Revolving Note, as amended by the Amendment, and certifies that it does not have any defense or setoff to its obligations under the Guaranty.

The undersigned certifies to Bank that its (i) Articles of Organization and Operating Agreement, and (ii) Corporate Resolutions and Incumbency Certification (Authority to Support Another’s Borrowings) dated December 23, 2011, each previously delivered to Bank: (x) remain in full force and effect, (y) have not been amended, rescinded or repealed in any respect, and (z) may continue to be relied upon by Bank until express written notice to the contrary is delivered to Bank.

Execution of this Reaffirmation does not amend or modify any of the terms and conditions of the Guaranty, and Bank may continue to rely thereon without qualification.

Dated: August 10, 2012