It was brought to my attention on this site that rain water can seep into the bumper past the spare tire bolt. As the bumper is a sealed unit, when water gets in, it can't get out. Simply drilling a hole or two in the bottom of the bumper will fix this problem. Not all units will have the spare tire bolt drilled through the bumper such as the dual 6V setup. No other parts of the frame are sealed, so this is not a concern anywhere else.
We have started adding a hole to prevent this problem.
Reace
We have started adding a hole to prevent this problem.
Reace