Hi Paul - I had the Winnebago "radius kit" installed on my first MH, a '93 Itasca, after the fiberglass cracked and dissolved in several spots, and I have to say, I thought it was a poor solution. Like yours, the kit provided full-length radii and moldings running fore and aft between the end caps. And, like yours, the moldings held lines of water next to and atop the caulking, not a good thing IMHO. One of the resulting problems was that the screws that anchored the moldings rusted underneath the caulking. But even worse in my mind, was the idea of having to continuously inspect and be concerned about potential leaks, and this really bothered me. Given your concerns (and I would have very similar worries), I would look into creating some kind of holes or divots or dents in the moldings to allow for drainage, and then maybe patch those spots with a single layer of EternaBond tape. I would also seriously consider pulling the moldings completely, and then gluing the radii followed with a good waterproof roof repair tape on all four seams. You can find out more about Eternabond by searching this forum or just Google it. The tape does not leak, has staying power, expands and contracts with weather, and is flexible so you could easily adapt it in different configurations to seal the drainage "dents" or seal all the seams. I used it to patch my '99 Pace roof, and it worked like a dream, no moldings, no screws, no caulk, no problems. I'm not sure I'm explaining this very well, but I would look into finding ways to drain that roof, as I think it is a problem waiting to happen. Just my thoughts, best of luck.
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'07 Itasca 35L/W22 FULL-TIMING
1000 Trails - VFW - 5 Yrs Army
"NOT ALL WHO WANDER ARE LOST"