Provided they don't blow out running too low a pressure, rv tires WILL age out loooong before they wear out, unless you're fulltiming & on the move a lot of miles. So in my opinion run them at max cold psi & not worry about wearing them out.
We are fulltime & did wear out a set of GY 614s in approximately 60k miles in 4.5 years running at max psi, tires wore even & true across the tread. Replaced with 17.5" Sailun H rated with new wheels for about the same money as just replacing the GY 614s.
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Full-timed 10+ years
Sold '13 Redwood FB
Traded '13 GMC Denali DRW D/A
Replacement undetermined
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