I'm not sure I buy into the "replace them after 3 years." The tires on my regular cars often have 5 years continuous usage under harsh conditions and don't blow out. They sit in the sun, rain, snow, on rocks, sand, mud, pavement and survive. I believe the trailer blowouts are not related directly to age.
Poor quality, out of round (like Chap says), lack of balance, over loading, over speed, under inflation all causing over heating are real reasons to look at.
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