I just can't figure what some RV'ers do to their tires to have blow outs. Been towing since '88, never had a blow out, only one flat tire from a nail. Most of the tires have been Chinese, don't like it but that's what Les Schwab sell, and the replace every 5-7 years is hogwash, manufacturers sure have figured out a sneaky way to get us to spend more money. I think blowouts must happen for three reasons, TT overloaded, tires under/over inflated and driving too fast particularly in hot weather. I always check the pressure before starting on a trip, 50-55 lbs cold. Had an '85 Wilderness with 10 year old Chinese 13" tires, towed for about 2000 miles before replacing cause tread was getting thin, no problems.
Recently bought a '05 TrailCruiser. The seller said he had had two blowouts that had damaged some of the undercarraige, but had been fixed. It had decent tires with about 60% tread left. Got it home and when checked the pressure all tires had 35 lbs. Called the seller and asked him if he always ran his tires at 35, he said yes, told him that's why he had the blow outs, should have been running 50 lbs as listed on tire.