Cummins ISX15 15 L Ultra Low Sulfur Diesel 550 hp Engine, US EPA Label, 1113 Engine hrs, Air Conditioner, Cruise Control, Power Windows, Engine Brake, Allison 4500 6-Speed Automatic Transmission, Triple Differential Locks, 40000 lb Front Axle, 69000 lb Rears, 89000 lb GVWR, Aluminum Wheels, 425/65R22.5 Front Tires, 12R22.5 Rear Tires, Dual Steering Boxes, Hendrickson Air Ride Suspension, 305 in Wheelbase, PTO, Double Frame, 1875 lb Capacity, Rear Mounted, Insulated Articulating-Telescopic Boom, Flatbed, Boom Tip Mounted Winch, Out and Down Outriggers, Rear Outriggers, 21 ft 3 in x 96 in Bed