Rocking chairs on gravel
When we bought our rocking chairs, we first used them on a concrete pad with a mat. No problem. But, most of the time, we set up on a gravel/sand/dirt or busted concrete pad and the rocking chairs don't like anything but a smooth surface. Thought about using a pc of plywood but that would present storage problems as well as the rockers "walking" on the plywood. Decided to try routing out a 2 x 4 to accept the rockers. They work great and don't present such a storage problem.
p.s. Saves the rocker tubes from getting dirt/sand and other debris in the slide/fold mechanism