Used Mack GU713 Tri Axle Dump Truck for Sale. Features: Single Frame, Air Ride Cab, Locking Front Power Divider, Single Exhaust, Auto Tarper, 17.5 ft. x 54 in. Beau-Roc Steel Dump Body, 18,000 lb. Hendrickson Non-steerable Lift Axle, Power Heated Mirrors, Power Passenger Window, Tilt Steering Column, Air Conditioning, Cruise Control, and more. Visit Liberty Kenworth and Coopersburg Kenworth to see our HUGE inventory of new and new and used dump trucks, daycabs, sleepers, trailers, and more.