Simply put, scale and moolah.
Most ST tires on the road are on non-RV trailers, like boat trailers, that don't usually see a lot of miles per year. On top of that, most RVs aren't really driven a huge amount either. So in both cases, there's no reason to engineer high mileage into the tread. Those owners are quite happy replacing them every 5-7 years.
Now, the tire makers could make the larger ST tires for high-mileage RVs last much longer. But those rich RVers seem pretty willing to spend billions a year on replacement ST tires. So why eat the goose that lays the golden eggs?
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