Maybe I'm out of line here, but I use 50 gallon plastic trash bags from Home Depot. I put 2 under each wheel, lay them out nice and flat, just the way they come out of the box. One on top of the other, just be careful that you don't step on them before you get the car on top of them, they are as slick as ice and you'll take a fall. I can actually push the car sideways, while sitting on the bags. Make an adjustment, then bounce the car and it should be good. This is my experience on my concrete floor in my garage, my floor is epoxy coated.
I hope it helps? I never thought of this until I dropped one of these bags and stepped on it. My elbow hurt for a month, from the fall.
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