Cat 3126 6 Cylinder 7.2 L Diesel Engine, Manual Transmission, 12000 lb Front Axle, 40000 lb Rears, 52000 lb GVWR, 34 in Flat Top Sleeper Cab, 295/75R22.5 Front Tires, 275/80R22.5 Rear Tires, Air Ride Suspension, 248 in Wheelbase, 18 ft x 100 in Bed, Pintle Hitch