Mercedes - Benz 6 Cylinder Ultra Low Sulfur Diesel 450 hp Engine, 2005 US EPA Label, Engine Brake, 10-Speed Manual Transmission, 12000 lb Front Axle, 34160 lb Rears, 46160 lb GVWR, Air Ride Cab, Aluminum Wheels, 295/75R22.5 Front Tires, 445/50R22.5 Super Singles Rear Tires, Airliner Air Ride Suspension, 183 in Wheelbase, PTO, Hydraulic Oil Cooler, Air Sliding 5th Wheel