I got a set of snap pads for my jacks. These are an awesome product. Gives you about an 1 1/2 more travel, a much bigger foot, and more stability. No more having to crawl underneath to put some boards down to make it level unless you really like to do that. Made of a strong rubber so they don't slide on loose gravel. Very easy to install.
RV SnapPad | Worlds Only Permanent Jack Pads 
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