Same for us. As we keep two of our three slides open for easy access in storage it is always on the levelers. Also, most of the major tire manufacturers advise removing the weight on the tires when in storage for a long period of time.
Like Charlie I do wipe down the exposed leveler shafts periodically but I use silicone dry lube which is indicated in our manual as it will not attract dirt like an oil like WD40 will.
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