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