This is only wild guessing, but here goes:
1- tire brand
- every brand must meet the same standards; my guess is that brand has more to do with traction and wear than reliability
2- under inflation
- load capacity is quite dependent on pressure, and trailers often require very nearly the whole load capacity of the tire at its maximum pressure
- for bonus points, under inflation causes heat generation
- do many people really tow at sustained speeds significantly in excess of 65 mph (with ST tires)?
- if the tires are underinflated for the speed, then the resulting failure could be counted under "speed" or "under inflation"
4- hot pavement
- really wild guess here, but only a small fraction of the tire face is actually in contact with the pavement at any time.
- I can see this being important to traction and treadwear, but much less so to causing blow outs
5- worn tires
- I assume that this means worn tread; I don't believe that the tread is for holding the air in or the tire together
- old or damaged body reinforcing plies would be significant
- example: impact damage
- I won't even guess at this one
- trailer tires bash curbs etc a lot, compared to cars; since they are often heavily loaded for their size as well, this must be a concern
1979 Boler B1700RGH, pulled by 2004 Toyota Sienna LE 2WD
Information is good. Lack of information is not so good, but misinformation is much worse. Check facts, and apply common sense liberally.
STATUS: No longer active in forum.