While looking for information re wheel size and wheelbase for WW1 vehicles (hint hint; how about forwarding any info you might have for European vehicles!!) I came across a couple of series that some of you might find of interest. The first is in Automobile Engineering, Vol 8, entitled Military Transport Chassis. Included are reports on the Commer 3-ton, the Dennis 3 ton, FWD 3 ton, Locomobile 3-4 ton, Maudslay A chassis, Peerless 3-ton, Pierce Arrow 3-ton, Saurer 5-ton, and Thornycroft J.
The second is a five or six article series re captured German trucks by LtCol Arthur J Slade, US Army, and can be found in Automotive Industries, Vol 41. Included are subjects such as axles, frames, drives, et cetera.
Both have considerable information and can be downloaded via HathiTrust.Org.