Just to continue with the tires, I had a inner 19.5 tire blow on me while i was airing it up on the truck. If this tire was on the outer position and the outer side wall blew, i'm sure that it would have seriously injured or even killed me.
Just before the tire blew, i started to hear the steel sidewall belts snap, i heard about 4 snaps and then the big bang.
Lessons learned: use a minimum of 10 feet or air hose to fill, listen for any tell tale snapping of the sidewall steel belts, never repair a tire that has run low on air.
You lifes worth more than a tire, be carefull..