Autocar Tri-axle Dump Truck. 1973 DC Triable model tri-axle with a rebuilt big cam 350 Cummins diesel engine and a rebuilt 8 speed low low transmission. the truck has 20,000 lb. fronts, 58,000 lb. rears and a 65,000 lb. Hendrickson walking beam suspension with walking beams. All bushings are tight. The tires are 24.5 rubber on the rear. It’s a full double frame dump truck.