Used Doonan Oil Field Step Deck Trailer for sale. Features: Full Width Tail Roller, 2 pop-up deck rollers, Forward Axle Lifts, Landing Gear, Wood Deck, Steel Frame, Top Deck Roller, Strobe Lights, 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).