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Dear Mr. Wnget,
Thank you for posting your request to the History Hub!
We searched the Records of the Office of the Chief of Ordnance (Record Group 156) and located a series titled Decimal Correspondence Files, 1918 - 1919 of the Motor Division and Truck Section. Sometimes drawings are included in the files.
We also searched the Records of the War Department General and Special Staffs (Record Group 165) and located a series titled Records Relating to Inventions Submitted for Evaluation, 1918 - 1921 that may contain the drawings you seek.
For access to these records, please contact the National Archives at College Park - Textual Reference (RDT2) via email at email@example.com.
We hope that this information is helpful. Best of luck with your research!