Rear hitch for bike rack

We used a two bike bumper mount set up on our old camper. Used it for about a year with 2 adult bikes on it. Then on a rough road the bumper started to break at the weld where it attaches to the frame. I thought about going with a hitch but decided to weld braces to the under side of the bumper on each side. Welded 1/8 steel at about a 45 degree angle from the lowest point on the end of the frame to the outer lowest point of my bumper. Re-welded the point where it had started to break and traveled all over the east coast for the next 4 years with no problems at all. Very cheap and fast fix. With that said, I have noticed that some trailers are using what appears to be even thinner metal on the bumper and some frame/bumper set ups will not allow you to weld a brace in at an angle. Without the angle it will not support any weight.
Jeff