I wasn't aware of these new HD Carlisles til the am tire Mgr offered them as an alternative and told me they had them in stock in Boise now. Upon reading this thread and a little more online, maybe the Carlisles are okay.
Their image has certainly taken a bad beating in online forums. Maybe they're trying to reinvent themselves?
What think? Let them swap the Carlisle HD 81mph rated for maxxis 65mph? Hmmm,
The Carlisle radial trail RH is a huge improvement over previous Carlisle ST tires. Granted they haven't been out long enough to see how they do in 5-7 years or how many miles they can last.
Carlisle says the HD is improved over the RH. If I was looking at a 15"/16" ST tire it would be a Carlisle HD or the Provider by Taskmaster which has a good reputation with commercial trailers owners.
Some thing to consider is not all sizes of Maxxis ST8008 have the added nylon tread belt. Maxxis doesn't advertise which sizes don't.
When shopping tires for a trailer expand your knowledge and google all type of trailering websites ....not just a couple of RV websites. They all have some thing to offer.