The "mismatched" system worked good for me. I would never rely on that rear bumper as a tie down point. Grab the corner of that bumper some time with your hand and watch it move back and forth. That bumper out there wasn't designed to have a camper pulling on it that way. Imagine a thousand pounds or more pulling on that corner. Try hitting a two foot frost heave at 40 plus miles an hour, it's only fun if you are set up the right way. On our trip we hit quite a few frostheaves hard due to not enough time to slow down coming through the Yukon and Alaska in the early spring; that's when the heaves are the worst, and the setup worked great. One 30 mile section between Kluane Lake and the Don Jack was so torn up we were down to 5 MPH at times. As I said if you use the right happyjack setup the right way, I believe a person won't have any problems with it.