Cummins ISX15 6 Cylinder Diesel 415 hp Engine, 2015 US EPA Label, Requires Diesel Exhaust Fluid, Engine Brake, Eaton Fuller Automated Transmission, 12350 lb Front Axle, 20000 lb Rears, 32350 lb GVWR, Air Ride Cab, 275/80R22.5, Air Ride Suspension, 158 in Wheelbase, Air Sliding 5th Wheel, Dual Fuel Tanks