to Airforums.com! You have the right place to get help with any and all questions about your new-to-you Airstream.
Just curious about what went wrong that means you need to change out all your plumbing? Are there multiple leaks, perhaps meaning that the previous owner (PO) didn't winterize?
While putting in PEX is a great idea, sometimes, it is much simpler to repair a single leak and live with the copper for a while. It always seems that there is so much to do on a trailer you just got, doesn't it?
When you get a moment, perhaps you would post a few photos of your TT (travel trailer)? We looove photos.