K-31 truck

First version on GMC AFKX-804, 4 ton, 4x4, COE with York Hoover van body: US Army Signal Corps Photo SC 124697.

Second version (B) on Autocar, truck 5-6 ton, 4x4, COE, VAN, U8144 with somewhat different York Hoover van body:

Reference File

TM 9-817