If you do use the beach ball approach, the key is to get them large enough so they do not move around easily under the covers. I have donated a few of the "play balls" bought from CVS pharmacies to some of the CG children on windy days, but they were smooth surfaces and probably not quite large enough. Good news is that they are cheap.
My only reason for keeping the water off the slide toppers is that if you are parked long term, staining will occur.
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