Hi Guys, I want to build a rack on the back of my 28' 5th wheel to carry a 500-600 lb 4 wheeler ATV. Does anyone have experience with this? What will the added weight do to hitch pin weight? I intend to put a receiver tube on each side welded to the frame so the rack can be removed when not needed. Please give me any feedback - pro or con. Thanks, Terry & Becky 98 Kit 5th wheel and new Powerstroke as soon as I can find the right one.