Detroit DD15 6 Cylinder 14.8 L Ultra Low Sulfur Diesel 505 hp Engine, 2017 US EPA Label, Requires Diesel Exhaust Fluid, Power Windows, Cruise Control, Air Conditioner, Engine Brake, Automated Transmission, 12000 lb Front Axle, 40000 lb Rears, 52000 lb GVWR, Air Ride Cab, 60 in High Rise Sleeper Cab, Bunk Beds, Bunk Heater, Aluminum Outer Wheels, 275/80R22.5 Front Tires, 275/80R22.5 Rear Tires, Airliner Air Ride Suspension, 223 in Wheelbase, Air Sliding 5th Wheel, Dual Fuel Tanks