Thanks, Ed! I'm not quite ready to tackle this project just yet (working on installing a solar system first) but you're instructions are incredibly helpful.
Last question (I think:-) - Did you place the galvanized u-type metal pieces on top of the existing/original aluminum framing in the roof?
I haven't reached out to Winnebago yet but I've been told that they will send a diagram of the framing upon request. My thinking is that if I utilize the existing framing it will be stronger than just drilling through the roof.