OK;
Let me add my two cents worth. Heat build up is a problem as the rate of decomposition with double for each 10 degrees C or 18 degrees F, but I don't believe that it is related to tire thickness. The heavy truck tires run for thousands of miles and are often retreaded.
I have had problems with Michelin tires breaking down on the side walls while the tread looks fine and has 80% of the tread left (measured). They had plenty of miles 60K+.
With the new compounds we tend to still look at the tread and this may not be the problem. We need to look at other problems with the tires.
Low strength on Nylon or polyester cord is normally do to residual water in processing of the fibers. Polyester is difficult to obtain the correct crystalinity to gain strength. I guess Allied France needed a polymer chemist.
I replaced a set of Goodyears at a little over 60K as they were starting to crack at the edges with lots of tread so the problem is not just Michelins.

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