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Dear Mr. Ponton,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located two series titled General Correspondence, 1915 - 1941 and the Name and Subject Card Index to Correspondence, ca. 1912 - ca. 1941 that has numerous cards for tanks and testing. The staff of the National Archives at College Park - Textual Reference (RDT2) will be pleased to make the Name and Subject Card Index available to you or your representative in the Textual Research Room located 8601 Adelphi Road, College Park, MD, near the University of Maryland--College Park campus. The Textual Research Room (Room 2000) hours are 8:45 a.m. to 5:45 p.m. Monday through Friday, except legal holidays. The RDT2 consultation room hours are 8:45 a.m. to 4:00 p.m., Monday through Friday, except legal holidays. No appointment is necessary. Prior to your visit, please consult College Park websites at https://www.archives.gov/dc-metro/college-park/, https://www.archives.gov/dc-metro/self-service-copying.html, and https://www.archives.gov/research/start/getting-started.pdf.
Photographic images of the Ford 6-ton or 7-ton tank may be in the custody of the National Archives at College Park - Still Pictures (RDSS). For access to these photographs, please contact RDSS via email at firstname.lastname@example.org.
We hope this is helpful. Best of luck with your research!