Used Peterbilt 389 Tri Axle Dump Truck for sale. Features: Single Exhaust, Chrome Bumper, Full Lockers, Double Frame, 20,000 lb. Steerable Lift Axle, 18.5 ft. Summit Smooth Side Aluminum Dump Body, Auto Tarper, 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.