Cummins ISX 6 Cylinder 14.9 L Diesel Engine, 2012 US EPA Label, Requires Diesel Exhaust Fluid, Air Conditioner, Cruise Control, Power Windows, Engine Brake, Eaton Fuller 18-Speed Manual Transmission, 12500 lb Front Axle, 40000 lb Rears, 52500 lb GVWR, Air Ride Cab, 54 in Mid Roof Sleeper Cab, Bunk Heater, Aluminum Wheels, 11R24.5, Air Assist Front Suspension, Air Ride Suspension, 236 in Wheelbase, Air Sliding 5th Wheel, Dual Fuel Tanks