Most informed folks in the RV community know that our tires will normally "age-out" before they "wear-out" so they are confronted with spending a bunch of money on new tires and sometimes even being charged by the dealer to take the old tires.
The other day we had some service done at home and I noticed the truck had 14 tires on it and they were all 22.5 size but they were not all the same size ( same on each axle but different between axles)
Now obviously this truck is used for local short haul service with probably a lot of relatively sharp turns in and out of driveways that result in rapid tread wear and a good portion of the time at less than max load.
Just something to consider when confronted with the question of what to do with your old tires. IMO there is a good chance companies like this might be interested for the right price.
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