good tires

What you do not take into account is the fact that the number of people towing, either an RV or any other trailer, that actually post on forums is a very low percentage of the overall towing public. Way less than 1/100 of 1%. Out of those that do in RV forums, you have a high percentage of people who never towed in their life. They buy a travel trailer or 5er, and the first thing they do is overload it. Then they proceed to clip curbs and drive off onto debris filled shoulders along with driving the same as when they're not towing,such as driving at high speed.

And you make my and other point. The percent that report ruined ST tires on forums is low ...but is a good indicator of what goes on overall. Your percentage number are your own though.
And its not just rv newbs who had tire issues. I've been on this web since '03 and just like others we've seen and heard from rv newbs...those who make short local trips with maybe 3500 miles a year...others who have been around for years and make cross country 20k-25k miles a year. They all had one thing in common....ruined ST tires.
Everyone doesn't run over curbs/debris or pull a overloaded trailer nor pulling their trailers above the tires max speed. Now your blowing smoke.
Nor do we read on these boards the highway should be choked with trailers pulled over with blown ST tires. Big Exaggeration there.

We racked up hundreds of thousands of miles with box and flat equipment trailers in a concrete business for years, being driven by guys whose idea of taking care of equipment was how fast they could get back to the shop at the end of the day. We never had a recurring constant issues with ST tires on those trailers no matter what brand they were.

"Back to the shop at the end of the day". Ok that says a lot about your fleet of trailers tire use. Short runs a day ain't going to heat a tire up like a rv making all day runs and especially some one like myself and others who make 600-800 mile a day runs for days at a time pulling for a living. Typically like a lawn service trailer that spends it life rolling across town to the next job site. Sure that type of work better fits a ST tire. Low miles and no all day long runs. Not everyone fits into your fleet trailers short daily run tire use scenario.
Or especially those of us running commercial plates that were on the road daily driving the max HOS till shutdown....then back on the road racking up 80k-90k miles a year. Hell we couldn't afford using 14"/15"/16" ST tires in this type work.

Most folks opinions about ST comes from their own experience or from one rv forum. Mine comes from my own experience with 5 road trailer with 28 tires on the ground rolling up 60k-80k miles per trailer but mostly from other rv and non rv forums. This way I see what tire issues others are having and what they did to stop those type tire issues.