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I'm kinda curious too. I run e rated ST225/75R15 too and just had a blowout after 3 years and less than 6000 miles. Tire look good but?? Maybe 3 years is the norm




I'm thinking you are right with the 3 years is norm statement. I have tried various brands and rated tires and it seems like 3 years is the ticket no matter how many miles on them. I actually think the less miles due to the way we use our trailers has an effect on their longevity. I was also thinking of changing to 16" tires but not sure if thats the fix