Volvo D12 6 Cylinder 12.1L Diesel Engine, 425 HP, Engine Brake, Eaton Fuller 8 Speed Transmission, Differential Locks, 51683 lb GVWR, 42 in Flat Top Sleeper, 295/75R22.5 Tires, Volvo Air Ride Suspension, 204in Wheelbase, Air Slinding 5th Wheel Hitch, Headache Rack, Dual Fuel Tanks