I have the Endurance on mine too. Only about a year old, maybe a couple thousand miles now. Look great, no wear at all yet, even tire temps and seem to pull really good.
We run maxxis m8008s on our 37 foot Eagle TT and have 9000 miles on them with no problems. We’re probably at the end of their duty cycle. You can’t really go by wear with ST tires. Our treads look perfect still. I will replace them at the end of the year as a precaution. I may go back with maxxis or try Goodyear endurance. I believe they both are great tires.