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Great topic that's been discussed before on many other boating threads, glad to see it brought up on WC.

In your friends situation, even though his tires looked good and had low miles, they sat for long periods in one spot which is terrible for tires. I typically replace my tires every three years. Trailer tires are different than car tires and trailers should only have trailer tires on them.

A group of friends of mine and myself, went on a long road trip with our boats this past July 4th weekend. The guy in front of me had a blow out on his tandem trailer and was seriously pissed off about it because he just spent a ton of money refurbishing his trailer. Upon questioning him I found out that though he put new bearings, bunks, lights etc on his trailer, he neglected his tires because he felt they looked okay. Come to find out his trailer hasn't been used in 7 years and the tires were 11 years old. To top it off they were car tires. It only makes sense that the tire would blow out with a combination of 102F temps, and highway speeds of 65-70 mph. This is a good set of circumstances to create a blow out.