Well, I am happy with the new roof we just got on our 2014 Sunseeker. I was nervous using an aftermarket company to repair our roof (RVroof.com) however this new roof appears to be tough as nails. I could see it outlasting the coach by 20 years. They removed those "rails" you refer to that hold the fiberglass down, screwed the fiber back down, then sprayed the whole roof with the poly coating, including down the radius sides. Now, the water is free to roll off anywhere it wants to. Time will tell how this roof holds up, but I essentially have two roofs. I was really impressed with David and Jennifer who did the work.