Beacher,
Under inflated tires can cause more problems than just poor handling. The excessive flex can over heat the tires and damage the side walls. I had a zipper tear in a Michelin with about 17,000 miles and was told that perhaps the previous owner drove it with low air pressure.
I put about 100 pounds in the tires on my 27K to decrease the rolling resistance and reduce sidewall flex. I suppose it abuses the shocks and causes more rattles. I put on about 6,000 miles with the higher pressure and all seems fine. The RV has 12,000 miles.
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