Question: how much part interchangeability is there between brands? For example, I have a 1991 Viking Deluxe 180. My partner in garage mod crimes and I are thinking about picking up a junker pop-up to strip for parts and then use the frame to make him a tear drop camper. I found a 97 Rookwood Premier 1901 that would be a good candidate if some or all parts are interchangeable. (I mean anything, LP lines, wiring harness, water supply, fridge, etc.) In my limited understanding, both were produced by Forest River, so can parts be swappable?