Can you track with those that have issues with any tires the following-
1) Curb Hopping
2) Under inflation
3) Over weight
4) Exceeding the speed capability of the tires?
5) How almost all ST Tire brands have added a nylon cap?
With a due respect Capri-I have run all manner of "Chinese" tires thousands upon thousands of miles, and never a problem because I know their limitations and know how to take care of them.
BTW-we all know Carlisle tires had issues 10 years ago, but their new (somewhat) HD radial is a solid choice along with the Endurance.
Allow me to explain where I am coming from.
When I was working I had access to fairly reliable data - quantity of tires produced, quantity returned, and the condition of each tire returned. We grouped the returns into 3 categories: 90 day returns (typically appearance issues and vibration), road hazards (beyond our control), and endurance (any structural failure not caused by a road hazard). Interestingly, there was a time related pattern to the returns for each group. In other words we could predict based on early returns what the future volume would be.
In the case of endurance returns, the volume peaked in the 3rd and 4th year after production and tapered off slowly after that. The typical failure mode was a belt leaving belt separation where the top belt would detach from the bottom belt and with partial or completely detachment from the rest of the tire - the top belt taking the tread with it. In about the year 2000 (the year of the Ford/Firestone debacle), the failure rate was on the order of 1 in 10,000 (0.01%), improving each year.
By contrast, a typical road hazard was a "Run Flat" where the sidewalls would detach from the tread. The result was 3 pieces (2 sidewalls and a tread), each otherwise intact. In particular, no belt separation.
The company I worked for didn't make ST tires, but I am familiar enough with tires to make reasonable predictions based on the other types of tires the company did make. (If you follow Formula 1, you'll understand that I found what happened in Baku very interesting!)
What this all means is that the average guy isn't likely to see an honest to goodness tire failure, even on a failure prone ST tire. I have heard of lots of folks who have had good luck with even tires clearly identified as failure prone.
The first 4 items on your list are not things that can be tracked. But it's a reasonable assumption that these would be the same regardless of who manufactured the tire. If those things affect tire failures, then it would affect each brand equally.
I am aware that many ST tires NOW have cap plies, where, before, none of them had them. I consider this a major upgrade and possibly the reason why we don't hear about ST failure much anymore.
What I had been tracking is reports on the internet of ST tire failures. In the past, Goodyear Marathons were clearly identified as having issues. I suspected that the reason for the large number of reported failures was because of their huge volume in the marketplace, but I didn't have a good handle on how big their percentage was - just that lots of people reported buying them (or coming on new trailers). Interestingly, ST tires made in China were also clearly identified as problematic - and the one thing that seemed to be a pattern was the brand name changed every year!
In the fall of 2017, Goodyear Introduced the Endurance series, and since that time I have yet to see any reports of Endurance failures - road hazards, yes, but no failures I couldn't identify as road hazard related. I also was aware that they had cap plies. I also could tell that since 2017, lots of people had purchased these and I was confident that if there was an issue, it would have surfaced.
What I am not confident of is the rest of the ST marketplace. I don't have a good feel for how many of the other brands have been purchased, nor if their presence in the marketplace is large enough to discern that their lack of reported failures is anything more than just a statistical anomaly.