Goodyear is making tires in the US again, and that’s what I switched to for the old trailer which used 15" tires.
https://corporate.goodyear.com/en-US/media/news/goodyear_launches_american_manufactured_trailer_tire.html
What is the GVWR on your trailer? What load range are you using?
Years ago when we were having blowout after blowout (high temps, high speeds, out West) it was always the drivers side tires that we’d lose. By doing the math, we discovered that load range D tires were overloaded given the conditions and the fact that horses carry more weight on their forehand (slant load trailer. Plus I had a water tank on that side.) We had to have 15" wheels special ordered to handle the 80 psi of a load range E tire for that trailer.
I have not yet had to replace tires on the new trailer (which has 16" wheels, one of my requirements since there are few options for load range E in a 15" tire) but will most likely stick with Goodyear.
Michelin would be the gold standard, if you want to pay for it!