Used 2018 Mack Granite GU713 Dump Truck for Sale. Features: 17.6 Steel Beau-Roc Steel Body, Single Coal Chute, 23k lb. Lift Axle, Single Vertical Exhaust, Air Ride Cab, Cruise Control, Power Windows and Locks, Disc Brakes, Steers and Drives, 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).