I'm not familiar with those tires, but you might go over to rv.net and do a search. It's getting tough to find a quality tire in the 15" sizes. A lot of folks with heavier 5ivers are upgrading to 16" wheels and Michelen XPS ribs. Lot of money, but piece of mind.
I've got Carlisle tires on my 5th wheel Toy Hauler. These are Chinese made, as are most ST tires these days. I check the air pressure EVERY time the trailer goes out, check them at every stop, and I keep my speed at 60 or below. Heat is the biggest killer for tires of any kind. I'm probably going to upgrade to the Michelens sometime in the future.