Just based on the dollar amount of damage a blown tire can do, potentially thousands of dollars, if you store outside I wouldn't push tires more than a year beyond that five year mark. If stored inside and out of the sun, maybe seven years. I had a rear tire throw tread on one of my cars, and it did $5,000 damage, and that was a car. On an RV there is all that plumbing, wiring and tanks under it. Not worth taking a chance IMO.
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