I used wood for years. It works OK. No slippage.
Wood can soak up water. That makes them weigh more when transporting, and make a wet spot in the bin. But they are cheap, and if they break you throw them on the campfire (assuming you haven't painted them.)
Now I almost exclusively use the Lynx blocks. They are lightweight. Do not soak up water. Hose any mud or dirt off, leave in the sun for few minutes to dry. We have 4 sets, we got them for free. Each rig we bought over the years came with a set. One set came via a door prize at a RV show, another was a gift.
I carry 4 pieces of plywood 18x24 to put under them on soft ground or grass. Give them a bigger footprint and do not sink into the ground.
The two different brands of plastic blocks (Lynx and Camco) are not interchangeable. They do not interlock with each other. So you must keep buying the same brand if you want to interlock them.
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So many campsites, so little time...
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