For those that put there car up for the winter... Flatstoppers ™ - For Long Term Vehicle Storage, Stops Flat Spots from Forming on your Tire during Storage! | RaceRamps.com your best solution for Lightweight Car Ramps! I'll sell mine for $225 shipped in the U.S.
I didn't have flat spots on my tires after winter was over, I was told the tires I own are susceptible to flat spotting. I'm selling my car to get a Corvette. So i'll no longer need them.