Cummins ISX15 6 Cylinder Ultra Low Sulfur Diesel 550 hp Engine, 2013 US EPA Label, Requires Diesel Exhaust Fluid, 19753 Engine hrs, Air Conditioner, Cruise Control, Power Windows, Engine Brake, 18-Speed Manual Transmission, Double Differential Locks, 14600 lb Front Axle, 46000 lb Rears, 60600.0 lb GVWR, Air Ride Cab, 72 in Mid Roof Sleeper Cab, Bunk Heater, Aluminum Wheels, 11R22.5 Front Tires, 11R22.5 Rear Tires, Air Assist Front Suspension, Low Air Leaf Air Ride Suspension, 262 in Wheelbase, Air Sliding 5th Wheel, Dual Fuel Tanks