Used Mack GU713 Tri Axle Dump Truck for sale. Features: Single Frame, Dual Power Steering Boxes, Locking Front Power Divider, Air Ride Cab, Single Exhaust Stack, 20,000 lb. Non-steerable Hendrickson Lift Axle, 17.5 ft. x 54 in. Steel Beau-Roc Dump Body, Auto Tarper, Air Operated Tailgate, Power Mirrors, Power Locks and Windows, Air Conditioning, Cruise Control, Tilt Steering Column, 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).