I've never given this much thought, but reading about this in another thread made me realize that the awning on my 1990 Starcraft has a zipper, that I "assume" is made for zipping on a screen room. Does anyone have any idea how I might go about finding one that would fit. Or for that matter, how much one might cost? That might kill the idea right there. :)
edit: Ooops. Nevermind. A little net surfing shows that they are pretty much out of my price range for the time being.