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My rule of thumb is new tires every seven years no matter what the vehicle/trailer tread looks like. If I have severe problems with two or more tires before the seven year mark, I replace them all, like I did on my 3750FL in just four years. Only had to replace tires before the seven year mark once in my lifetime. This includes MHs, fifth wheels, truck camper, bass boat, pontoon, harley, etc. I am not a big annual mileage type so that has never been a part of my tire usage.
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