I have HiJackers on our '99 Slumber Queen Adventurer. The machine shop that made them in Victoria got bought out, so parts are no longer available. For the O-rings it's no big deal, they can be picked up at any auto parts store. But special socket wrench for the keeper, you have to make. I haven't found the measurement on the 'net yet. The leg is held on by a bolt at the bottom. That will get it off for painting.
Adventure before dementia