Cummins 6 Cylinder 8.3 L Diesel Engine, US EPA Label, Manual Transmission, 20000 lb Front Axle, 40000 lb Rears, 60000 lb GVWR, 425/65R22.5 Front Tires, 11R22.5 Rear Tires, Dual Steering Boxes, Hendrickson Rubber over Walking Beam Suspension, 236 in Wheelbase, Double Frame, Rear Mounted, 16 ft - 14 ft 2 Section Boom, Enclosed Cab, Out and Down Outriggers