Actually, we had gotten something from Carlisle about this the other day at the shop. I do remember it being that some kind of tire they had was speed rated for over 65mph.
and Carlisle states the same on their website as the link above in the OP with a few caveats:
How fast can I travel on Carlisle trailer tires?
In the past, most trailer tires were rated at 62 or 65 mph. Today, some of our tires are "rated" (speed symbols) at 87 mph (N), some at 75 mph (L), some at 65 mph (J: ST tires) and some at 62 mph (J: non-metric tires).
Please remember that speed ratings are test speeds and not recommended driving speeds. The ratings apply only to the tire itself, and not a particular vehicle. The speed rating does not mean that the vehicle can be safely operated at the tire's rated speed.
We recommend driving no more than 60 mph when towing a trailer. Please always drive at a safe speed and abide by the posted speed limit.