Anybody ever use these? Last week the weather was good and I was able to take the car for a ride. The tires had some serious flat spots from sitting a couple of weeks. The weather forecast is snow and cold for the foreseeable future, so I thought I’d give these a try. I had to buy two snap together sets to be wide enough for the 295’s on the rear. I had to jack the car up because they would slide on the concrete floor when I tried to ride over them. I’m sure if I attached them to some plywood in the future, it would eliminate that problem.