If you go to the Azdel website, you can see that Rockwood, Flagstaff, and Prime Time all use it in their camper trailers, but not in their fifth wheels. What the heck is up with that? I sure would have liked to have it in mine, considering that I paid a lot more for a fifth wheel.
It's interesting that the Azdel website lists Rockwood trailers as using their composite sidewalls, yet, the Rockwood brochure says they use Lamilux which is a European manufacturer (Azdel is made inthe US.) So to answer your original question it seems that they do not use Azdel. I just bought a 2306 and am going to try my best to seal it to try to prevent water from getting in. I bought it for the floorplan which I think is superior for our needs. I don't think there is any product that completely eliminates the possibility of delam. You just need to maintain it and be vigilent.
Finally, I have read where others have been successful in using the comprehensive portion of their insurance plan to cover delam issues. You may want to make sure whatever insurer you go with will cover delam. That way if you do have an issue, you're only out your deductible.
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