Rudi and Ellen,
I don't think I would lower the air pressure for storage. I would put it away with the pressure set the same as if I were towing it. I would also check on it once in awhile to make sure it didn't have a flat. Sitting with a flat for very long WILL ruin the tire.
Several years ago, when most tires were bias ply, they would get flat spots on them from sitting in one position. Depending on temperature, it could happen overnight. With today's radial tires, the thump, thump, thump, of flat spots is a thing of the past. If you are worried about it, set it on blocks with the tires off the ground.
Just my opinion, Glenn or someone else may have more to add.
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