Hi brrving -
Welcome to irv2
We're really glad to have you here as a new member and are looking forward to reading your posts about your RVing experiences and adventures. You'll find a great bunch of folks on this site who are very knowledgeable of RVing, the rigs we use, and the places we go in them. Enjoy the forums and post often, and when you (or anyone else) want to be a official member of the forum, and not just a new member of irv2, let me know.
I used to have an in-ground pool, and used the same type of ball/pillow to keep the cover from slowly getting covered with water and sinking. Not very elegant, but it worked. Certainly easier to install than on a 12ft+ rv, however. Sounds like 'crudeman' may have a solution.
Thanks!
Ron