I believe that a 1 1/2 ton is the smallest GVW wise. I don't have my books handy but I know there were several wheel base lengths offered.
Here one from a fellow bolter, which I believe may be a 2 1/2 ton but it gives you an idea.
http://www.stovebolt.com/gallery/mueller_brian_1946.html I'm sure you could find a vintage looking dump bed to put on a a cab and chassis.
I look forward to seeing pull into TW Perry's for a load of lumber!