Used Mack GU713 Tri-axle Dump Truck for sale. Features: Single Frame, Single Exhaust Stack, Air Ride Cab, 20,000 lb. Hendrickson Non-steerable Lift Axle, 17.5 ft. x 54 in. Beau-Roc Steel Dump Body, Auto Tarper, Body Vibrator, Power Heated Mirrors, Power Passenger Window, Power Locks, Tilt Steering Column, Air Conditioning, Cruise Control, Dual Power Steering Boxes, and more. Hundreds of new and used trucks, trailers, and parts for sale at Coopersburg & Liberty Kenworth. Three convenient locations: Coopersburg, PA (near Allentown), Swedesboro, NJ (near Philadelphia), and TRP Parts (Pottstown, PA).