Used Mack GU713 Tri-axle Dump Truck for sale. Features: Air Ride Cab, Single Frame, Dual Power Steering Boxes, Single Exhaust, Auto Tarper, 17.5 ft. x 54 in. Steel Beau-Roc Dump Body, 20,000 lb. Hendrickson Non-steerable Lift Axle, Power Heated Mirrors, Power Passenger Window, Tilt Steering Column, Air Locking Tailgate, Body Vibrator, Power Locks, 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).