Used Mack GU713 Tri Axle Dump Truck for sale. Features: Heavy Single Frame, 20,000 lb. Non-steerable Lift Axle, Hi-Lift Tailgate with Coal Chute, Body Vibrator, Electric Flip Tarper, Air Tailgate Release, Power Passenger Side Window, Power Locks, Heated Chrome Power Mirrors, Tilt Steering, Single Vertical Exhaust, Air Ride Cab, 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).