Blow out on sidewall. Going 55 MPH, tire pressure was good, tire has less than 1,000 miles on it.
I was just cruising along and it just exploded. You can see part of the steel belt hanging out. This was on the outside of the trailer.
It was the youngest tire in the set, no rot or cracks. Trailer spent its life in the shade on cement pad.

Any ideas? Just a bad tire?