I just purchased my first fifth wheel trailer and the king pin comes straight down . I have a shortbed truck and don't think I have the room I need for regular driving . I noticed that 99% of 5th wheels have an extended kingpin box . I am not in the market for an expensive air shock or airborne box . I am looking for a basic box , used if possible . Where can I get one . Does anyone have one for sale . I tried salvage websites and e-bay with no luck .