Used Mack GU713 Tri Axle Dump Truck for sale. Features: Heavy Single Frame Rails, 20,000 lb. Non-steerable Lift Axle, Single Vertical Exhaust, 17.5 ft. Beau-Roc Steel Dump Body with 2-way Tailgate, Electric Flip Tarper, Air-operated Tailgate Latch, Power Passenger Window, Heated Power Mirrors, Tilt Steering Column, Painted Steel Bumper, Single Roof Mounted Air Horn, Air Ride Driver's Seat, Air Ride Cab, 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).