Detroit Ultra Low Sulfur Diesel Engine, 21384 Engine hrs, Air Conditioner, Cruise Control, Power Windows, Engine Brake, Automated Transmission, 12000 lb Front Axle, 40000 lb Rears, 52000 lb GVWR, Air Ride Cab, 72 in Mid Roof Sleeper Cab, Aluminum Wheels, 285/75R24.5 Front Tires, 285/75R24.5 Rear Tires, Air Ride Suspension, 237 in Wheelbase, Air Sliding 5th Wheel