Used Mack GU713 Quad Axle Dump Truck for sale. Features: Single Frame, Dual Power Steering Boxes, Single Exhaust Stack, 20 ft.x 50 in. R&S Steel Dump Body, Auto Tarper, Air Ride Cab, Dual Hendrickson Steerable Lift Axles, Power Heated Mirrors, Power Passenger Window, Tilt Steering Column, Air Conditioning, Cruise Control, Dump Body Vibrator, 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).