Cummins ISL 6 Cylinder 8.9 L Diesel 370 hp Engine, Webasto Engine Coolant Heater, Allison 3000RDS Automatic Transmission, Double Differential Locks, 18000 lb Front Axle, 40000 lb Rears, 5.29:1 Axle Ratio, Air Ride Cab, Aluminum Wheels, 385/65R22.5 Front Tires, 11R22.5 Rear Tires, Air Ride Suspension, 225 in Wheelbase, Electric Roll Tarp