I didn't buy these to use with camco's leveling blocks to raise RV tires, but to provide a wide surface for jack stands. The sharp edges of the jack legs and even the jack wheels/rollers dig into my sidewalk. I normally use stacks of cardboard, but over time this becomes inadequate due to the sharp edges/corners of my jacks (Craftman and Torin brands). The shape doesn't match the position of the jack legs, but once the jack legs are on, they stay in place and spread the weight load. The price is right if you want them big enough to mount a tire on, and there are other products from Camco that they work with. Oh, and they're reasonably priced for a pair. The blocks themselves are fairly thick and mostly rigid, but they do flex a bit. Overall I am very happy with the purchase and wish I had received them sooner. I have no plans to buy more products, they are enough for me. The flex feels stiff enough that you can safely use them on grass. I definitely wish I had invested in them a while ago. My only concern is that I wish they weren't so big. If I wanted my racks to be in their lowest position they would probably add at least an inch to the overall height.
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