Used Witzco Challenger Tri-axle Lowbed for sale. Features: Briggs & Stratton Pony Motor, Electric Start, Swing-out Out Riggers, Flat Deck added to Neck, Flat Rear Deck, 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).