Used Mack GU713 Tri Axle Dump Truck for sale. Features: Dual Power Steering Boxes, Single Frame, Air Ride Cab, 20,000 lb. Hendrickson Non-steerable Lift Axle, 17.5 ft. x 54 in. Beau-Roc Steel Dump Body, Auto Tarper, Air Tailgate Lock, Stainless Heated Mirrors, Power Passenger Window, Tilt Steering Column, Air Conditioning, Cruise Control, and more. Coopersburg & Liberty Kenworth has new trucks, used trucks, trailers, and parts for sale. Locations: Coopersburg, PA (near Allentown), Swedesboro, NJ (near Philadelphia), and TRP 068 (Pottstown, PA).