There is positive feedback from those who tow with the newer, redesigned Carlilse ST tires. As most of us know, Maxxis ST tires has been enjoying positive reviews for a number of years. Similarly, I have always got good service from our ST tires, even the cheap stock tires that came with our rig. I expect 4 years or 20K plus miles (whichever comes first) and we've been fortunate to get that and have never had any blowouts while towing.
Contrary to what some perceive, any tire can be had and ordered by any reputable tire dealer. Heck, when Discount Tire tried to insinuate that Maxxis ST tires were scarce and difficult to get, I went home and ordered them online from DiscountTireDirect.com, had them on my doorstep 3 days later. He sure looked embarrassed when I brought them over to be mounted and balanced. There was no hard feelings, I realize it was his job to sell tires that provided the biggest profit margin.
In the long run, LT tires are the best choice although available selection in a 15" tires is limited. For the most part, ST tires serve their purpose and are fine for rigs 10K# or less. I think either Maxxis or the redesigned Carlisle ST tire will be good choices, plus it's apparent you take good care of them which is paramount to the success of any brand ST tire. I did what others have done and went up a load rating for added safety margin.
