Used Mack MR688P Rear Load Refuse Truck for sale. Features: Double Frame, Single Exhaust, Front Mount Pump, 20 yard Heil Rear Load Trash Body, Stainless Mirrors, Sliding Door Windows, and more. Cabover. 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).