504,110 Miles Cummins X15 Engine, 450 H.P. Engine Brake Eaton Automatic Transmission 80 Inch Ultra-Loft Sleeper Upper Bunk 40,000 Lb. Rear Ends 2.79 Ratio Air Ride Suspension Hydraulic Power Steering Air Conditioned Dual Aluminum Fuel Tanks Horizontal Exhaust Exterior Visor Cab Extenders Stainless Steel Quarter Fenders Bunk Heater Tilt And Telescoping Steering Wheel Cruise Control Power Windows TriPac Auxiliary Power Unit Adjustable 5th 245 Inch Wheel Base Disc Brakes 22.5 Low Profile Tires Aluminum Disc Wheels.