thanks for the link Carl.
I do find it interesting that they make no note of the load index and how many of those vehicles were loaded up and exceeded the index. nice little clue to me was the "road trip" IE pack tons of crap and people onto the car.... combine that with likely improper tire pressure, high temperature and long operating time... its pretty likely.
why do we see so many separated treads on the freeway? people don't take care of their tires. deteriorating tires don't help though...