The way it was explained to me by a fellow that owned and operated a tire business for more than thirty years, When tires sit for periods of time on gravel, dirt and other components, moisture penetrants the tire into the belts of the tire and causes rot/decay of the belt and therefore failure. By placing the tires up on wood, you are keeping tire from absorbing the moisture.
Also by putting covers on the tires, you are keeping the Sun RV rays from causing tire deteration which will create failure.
Also when my RV is going sit for a couple months in one spot anytime I place my plywood pads under the tires.
Like I stated in my first post, I have done this since 1989 with my RV's and never had any tire problems or failures.
Ron
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