Well, I had mine stationary for 4 years while I was working in Canada. At first I tried bringing the slides in every 3 months but that was way to much work so I stopped. Once we decided to move it to our Montana house we just took it in for a complete check up and everythng was fine. Of course, our tires were made in the USA. I did make sure that I did a good flush cleaning of the gray and black tanks every few months.
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