I got a chance to pick up this one off hand built truck. Sooooo, I jumped on the deal.
The chassis and axles are from a Tamyia Hilift the truck still has the 3 speed transmission but the transfer case has been clocked 90 degrees. The body is 100 % scratch built from styrene.
It is a plastic for model building. Custom car builders and model train builders use it. It comes in sheets, bars, beams, and rods of various lengths and thickness.