I've been doing a lot of research on this lately. Consensus is the two brands mentioned above are the best choices. Good Year Endurance and Maxxis ST M8008. After reading lots of reviews and watching lots of YouTube videos, it seems that either of these would be hard to go wrong with.
The GY is speed rated to 87 MPH. I've seen conflicting stories on the Maxxis speed rating, some say they don't carry a speed rating which defaults them to 65 MPH, others say they carry a Q which would rate them to 99 MPH. I couldn't find a spec on the Maxxis web site.
As far as I can tell, the Goodyear Endurance is still made in the US and I believe is the only trailer tire made in the US. Maxxis appear to be made in Thailand. I do not intend to ever buy another tire made in China. This isn't a political statement. Regardless of your political feelings about made in US vs China, my personal experience with Castle Rock tires and the plethora of stories from others, to borrow a phrase from Ralph Nader, I believe the majority of Chinese trailer tires are unsafe at any speed.
Current RV Information: 2018 Forrest River Salem Hemisphere 282RK
Previous RVs: 2004 Fleetwood Bounder 32W; 1999 Four Winds Five Thousand 21RB; 1986 Allegro Bay 27'