Lyle, I believe the problem runs even deeper. The ST tires were given inflated ratings base on speed restrictions. Ratings were increased on ST235/80R16E to cover 7K axles. Now to satisfy higher speeds we are seeing the speed restriction going up from 65 MPH to 75 or posted speed limit.
It is past time for ST tires to have to pass the same testing standards as LT tires.
We are however in a market driven arena where a cheap important component times 5 is being ordered by bean counters and not product reliability engineers. Tire warranties are always pushed off to the tire company and not the vehicle manufacturer.
When is the last time a far East company stepped up and provided support for a failed ST tire including payment for damage to the trailer?
The best advice, and I have given it for years, is to not leave the selling dealers lot on cheap tires. Resolve the issue before delivery.