The tire pressure didn't have much to do with the failure. It was the age. When I got my tires replaced, we noticed that they were made in 2002
and that they had some dry rot more serious than I thought.
I went with a matching pair of p215/75 with a surprising amount of tread on them for $30 each (I'm not going to ask the shop where they came from). Made in 2008. Much better. I put them on the front and left the big ones on the back. 2 fold benefits: maintain the taller final drive ratio, and lower the front about an inch. Yeah, I have a hot rod jeep!
Furthermore, with the old tires on the back, if one should decide to blow out, I will have a rear tire blowout, not front.