Truck camper question, rear tire blew?

I have many thousand miles on my 19.5's, all here in Alaska on some of the roughest/toughest roads around. I run the recommended 110psi in the rear, and 100 psi in the front. Under-inflation can cause issues with tires, but it is usually due to overheating the sidewalls. 19.5's have VERY Thick sidewalls, so I don't think your tire pressure had anything to do with it, but when hauling heavy, I tend to try to stick with MFGR's recommended tires pressures. I haven't had a blow-out in several hundred thousand miles following that rule. Actually the last blow-out I had was in 1985, and was because I was running true baloney skins, trying to save up for new tires, and hit a piece of road debris. The tread separated on a 31x10.50x15 diagonally across the tread from sidewall to sidewall leaving a 18" opening through the tire! Since then I keep an eye on the tread, and always check the air before long trips, and at least twice a year, or when loading up a heavy load.

Garry in AK