I wouldn't let one persons bad experience with the Carlisle bother me. In any discussion about any particular brand of tire, there will always be one or two folks who will claim to have had nothing but bad luck with that tire. Meanwhile, there are hundreds of folks who have had great luck with said tire. As there are multiple causes for tire failure, the one or two naysayers may be causing their own failures, and not realizing it. Myself, I've had Carlisle's on both of my last two rv's, and have absolutely nothing bad to say about them. The Maxxis 8008 ST tire is also supposed to be a good tire, but cost $50 more per tire. Again, I've read about those failing too. I will say, those are the only two brands that I would consider, after countless hours of reading and researching.
The Carlisle HD also sports an M speed rating, up to 81 mph. All other ST tires that I know of are rated up to 65 mph. I don't exceed 70 mph while towing, but it is comforting to know that you could without worrying about the tires coming apart.
Becky, Bob and Taylie & Bode
2009 Silverado 2500HD Duramax/Allison
2014 Heartland Sundance XLT 245RL