I have had 2 sets of Carlisle's on our last 2 trailers. Had each set for 2yrs, no issues at all. Held pressure between trips, and during winter hibernation. Only replaced the tires because the rest of the trailer was replaced as well each time!!! Lol
First set was the model before the RH's came out, second set was the RH's.
In speaking with a gentleman at Carlisle back in the fall, they have a new model that is suppose to come out in the spring. New tread design, lower rolling resistance, and can't remember what else he said was new. Lol
Both the RH and the new model are speed rated above 65mph. If I remember right, 16"- 75mph, 15"- 81mph, 14"- ? may have been 81mph also.
Somewhere on here the was thread about Maxxis. They are also speed rated above 65mph, but don't recall the exact amount.
As for other brands, well.... Not sure I would go there unless I had to.
This coming spring I plan on replacing the stock tires our Jayco came with, stepping up to the next load range for more "reserve capacity". May be an option to look at if your rims are able to handle the higher tire pressure.
Good luck!!!