Last weekend I was working on a burn pile the ground is slightly slanted, the forks would slowly work their way over to the center. I did have one fall off when it got to the gap. Them buggers are heavy, probably 120 lbs each not to bad to to put back on, you can hook the top with the tractor, tilt back then slide the bottom in, I was contemplating that I need to make something to keep them from sliding,