This is same manufacturer of the ones you asked me about in the other thread. THey work very well on the older dodges. They come with a subframe that crosses the frame rails and ties the shackle mounts together on the frame. The bags are mounted on seperate arms that connect to the shackles on yout springs allowing it to take up bumps that would otherwise send your kidneys into your throat in a 1st generation dodge. I had a full height service body on my old dodge loaded with equipment, the ride was better than with the stock bed after installed the bags. The rear setup is nice, but it eliminates the chance for a spare tire or rear fuel tank.