rdemore wrote:
I am curious about what happened and if air pressure had a effect. The two tires that blew were put on summer 2012.
You have to ask? Really ??
You started out inflated 13 PSI OVER THE RECOMMENDED PRESSURE and then drove to a warmer climate.....which just made matters worse.
But you didn't include what are possibly the most important pieces of information:
What was the max. loaded pressure on the side of the old tires ?
How many miles did they have on them and were they visibly worn ??
How heavily loaded was the trailer ??
Were these the right load range tires for the vehicle ?
So....yes, if you abuse your tires, they will fail quicker.
(Edit)
Now I see that you changed load range ratings with the failed tires. It is even possible that they did not fit the rims right.