Used Mack RD688SX Rear Loader for sale. Features: Air Ride Cab, Locking Front Power Divider, Double Frame, Single Exhaust Stack, Stainless Mirrors, Leach Rear Load Trash Body, 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).