I am sorry you have this problem and with all due respect, you are part of the problem. Lippert asked you to find a qualified shop willing to repair the frame, and apparently offered to assist with if nothing else, the knowledge on how to repair. You in turn, said not my problem its under warranty you find someone to fix it. Why don't you become involved, work with Lippert to get it fixed, and move on with your life?
It seems that Lippert's dealer network in the area is not qualified to make the repairs, and they want you to help in finding a shop to do the repairs. Seems very reasonable on their part.
