Leak problems I have found
I am in the process of totally re-doing the outside of my '89 Gulf Stream Classic. It had wood rot on the outside under the skin, and I had a hard time figuring out where the water got in at. One area that rotted was behind the driver's door, and underneath it, also. I found that the sealer behind the door frame aluminum at the top had separated from the skin just enough to let water into the door frame. From there it spread out and down and rotted about 25 sq. ft. of plywood skin, which I ended up having to replace. That was the last place I looked for leaks, and it wasn't obvious at first even when I did find it. Other areas that caused problems were below or next to the molding strips that cover the seams in the skin. They are screwed into "nothing" basically, and moisture starts seeping into the wood along those, also. I eliminated all of them by fiberglassing all the seams together to make one big smooth skin, but had to replace a lot of plywood before I could proceed. Now the only trim molding left anywhere on the sides is the vertical one where the rear shell meets the side sheeting, and I'm even considering glassing that one before I'm done.
I said "I'll own a motor home when pigs fly"...Well I now own the "pig", and love it!