We own a 323 bhs. We are camping in Colorado and the nights are still very cold. The furnace has a horrible rattle that is waking everyone up at night. The fan motor seems fine but through out the heating cycle we get a major vibration. Comes and goes through the cycle. Any thoughts for a dyi fix? We are hundreds of miles away from the dealer. I am ready to call a moble repair service so we can sleep! Hope Grand Design would approve that type of repair.