Was it where the bumper attached to the trailer that broke, or where the reciever attached to the bumper or... sorry, just having a hard time picturing it.

Was the reciever attached to the frame or to the bumper itself?
If there is one thing i've figured out from all the rv sites i've looked at, it's that the bumpers are never strong enough to support the weight of a bike rack and you have to attach to the frame itself to carry the load.