Our new house has a steep driveway and I pulled/scratched the bumper about 2 feet getting in and out. I just installed them in our RV this weekend when we went out for the last time this year before packing it up for the winter. At the end of our journey, as I turned onto a gravel road, I slowed my pace to touch it as gently as possible. I was optimistic at first as I parked on the curb to inspect the situation. I didn't hear any rattling like before, nor did I feel the familiar "pull". But as I got closer to the rear, I saw that the metal on the inside of the passenger-side wheel had just crumbled and was just hanging off the center. If I were to spend $20 on them I'd say you get what you pay for, but I definitely expected more from them based on the cost. You must purchase the 3" square U-bolts separately as they are not supplied with this unit.