dually dump bed wc dodge 4x4?

So i know this may be hard without pics yet but a friend of mine has what looks to be an old 1/2 ton weapons carrier with warn lockout hubs dual rear wheels and a pto driven hydraulic dump bed that has a delivery date of 1941? The rear axle is centered as well.

Where the heck would you even find brake drums for these old things? I have seen the pads but drums seem to be non existent?

Is there a civilian rig that has the same brakes?

Also what trannsmission does this thing have in it if it is a 1/2 ton wc?

What other engines will bolt right up to it besides the straight 6 series of engines?

Well Pics would help alot also know what kind of truck and who made it. Chevy made some 4X4 dump trucks but they were bigger than 1/2ton I think they were 1 1/2 ton.

yeah i had a g7106 chevy 1.5 ton, this is definitely a ww2 weapons carrier. The rounded grill and slanted butterfly hood give it away.

ok well try Vintage Power Wagons-- Your Source for Dodge Power Wagon Parts and Trucks! -- civilian military m 37, m-37 wc Dodge Power Wagon