Military Chevys from 1942-45 had the battery mounted on the right side frame rail immediately behind the cab. From the image, you can see that the cab corner is actually clipped for clearance.

http://www.surfacezero.com/g503/sho...6-battery-box-cover-details&cat=1685


1941 Chevy 1 1/2-ton WW2 4x4 dump truck
In the Stovebolt Gallery
Lots more pictures