D13 6 Cylinder 13 L Diesel 455 hp Engine, US EPA Label, Requires Diesel Exhaust Fluid, Air Conditioner, Cruise Control, Power Windows, Drive Line Retarder, ATO2612F 12-Speed Automated Transmission, 13200 lb Front Axle, 37478 lb Rears, 50678.0 lb GVWR, Air Ride Cab, 42 in Mid Roof Sleeper Cab, Bunk Beds, Bunk Heater, Electric Sleeper Air Conditioner, Aluminum Wheels, 11R22.5 Front Tires, 11R22.5 Rear Tires, Air Ride Suspension, 239 in Wheelbase, Air Sliding 5th Wheel