[twindman]

I had a truck tire fail once. The alarm went off. Fortunately I wasn't towing at the time - just sight seeing. I checked the tire and was about 40lb. 2 miles to town and stopped at gas station - now about 30 lb. Added air but it actually went down more to 25. Attendant said tire store 1 mile down the road. Got there and had about 20 lb. Nail in the edge of tire right by the sidewall - unpatchable. Got a new used tire to get home and then bought a new one from my dealer (or got all 4 - I don't remember).