Detroit DD13 6 Cylinder 12.8 L Ultra Low Sulfur Diesel Engine, Air Conditioner, Cruise Control, Power Windows, 12000 lb Front Axle, 40000 lb Rears, 52000 lb GVWR, Air Ride Cab, 295/75R22.5 Front Tires, 11R22.5 Rear Tires, Air Ride Suspension, 172 in Wheelbase, Air Sliding 5th Wheel, Dual Fuel Tanks