Yeah sorry, but I'm on the skeptic side too. I may buy that they improve handling a little, or noticeable improvement, but to go from fighting the steering wheel down the road to:
"My RV no longer seemed to notice any winds, other than the wash from an occasional semi."
I was on a 1000 foot long cruise ship in Alaska a few years ago and the Captain smashed into in the corner of the dock trying to get in with high winds. If he had just installed some plastic tabs on the boat the wind would have no effect? Okay, that's an exageration, but as somebody already pointed out, no matter what you stick to the side of your motorhome you're still going to have 350 to 450 sqaure feet of sail on the side of that motorhome.