I am not looking to increase the capacity of the trailer, I just have some issues with the tires rubbing on the outside of the frame when you approach capacity. The way they built the trailer, you only have about half an inch between the frame and inner sidewall of the tire. With a moderate load, the tire ends up rubbing when you hit bumps and such. I also thought of just getting some half inch spacers for the wheels, but I think the airbags would be better.