Followed a delivery guy from Indiana last week pulling a TT through N. Cal. on a stretch of road that was rather rough in spots and had lots of tight turns. We'd slow down on the rough sections, he didn't. He'd pull away on straight stretches and was doing well above 65 mph. We'd catch him where there was a lot of twists and turns (he had no WDH). I would hazard a guess that many TTs have their tires abused by delivery drivers and out to the west coast, that can be over 2,000 miles. It bothers me that the RV industry sells you a TT with ST tires that are essentially used and may have incurred damage when you take ownership.
I don't understand the 65 mph rating and limitation. Why would the tire industry and regulators do this? 65 mph is so easy to exceed on a freeway and MANY highways in the US. I find myself constantly watching the speedometer and GPS in an effort to drive at max. 65 mph and it is not easy and on a long leg of a trip gets tiring and stressful. Why didn't they come up with a 70 or 75 mph rated ST tire???