I have a pdf of what he refers to. Sorry no link. it is Goodyear PSB #2014-01. To quote:
"If Goodyear tires, with the ST designation, are used at speeds between 66 and 75 mph, we recommend the cold inflation pressure be increased by 10 psi above the recommended pressure based on the trailer placard for normal inflation and load conditions."
While this would appear that Goodyear condones running at up to 75 mph with increased pressure, they do NOT state that ST tires are rated for anything above 65 mph. It is merely a recommendation.
