Paccar MX-13 Ultra Low Sulfur Diesel 455 hp Engine, Air Conditioner, Cruise Control, Power Windows, Engine Brake, Eaton Fuller Automated Transmission, 12000 lb Front Axle, 22700 lb Rears, 3.21:1 Axle Ratio, 34700 lb GVWR, Air Ride Cab, Aluminum Wheels, 295/75R22.5 Front Tires, 295/75R22.5 Rear Tires, Airglide Air Ride Suspension, 150 in Wheelbase, Air Sliding 5th Wheel