Hey, I can tell you about the time I was descending from Ryegrass, WA to Vantage, WA (almost a 2,000 ft drop over 12 miles)while driving a set of doubles loaded with bulk cement and grossing 105.5K lbs and got a blowout as I was about a quarter mile from vantage. I got the tire fixed and got to about 6 miles outside Spokane and had another blowout! Talk about bad days.