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We carry plastic and wood blocks.
One advantage to the wood blocks is you can spray them with bug spray and after a few times or so the blocks have soaked up the spray and kills the bugs before they climb too much further up onto your rig.
We park quite often at the coast where the ground can be wet and over a period of a few years the blocks need replacing.
We primed and painted new blocks with several coats of paint to make them last longer but now we don't have the advantage of the blocks holding onto the bug spray. We carry bug spray and spray when it looks like its a site where we'll need it. We'll also spray a ring around the tires sometimes.
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