I was a little suspicious when my tire man recommended Nankang tires for my Airstream. They are made in Taiwan, 225-75-15, D rated. I bought them because he has been very straight with me, and sells brands that work, not tied to one brand. His store is OK tire, and he sells me Cooper for the Ram, Toyo for the Voyager, and Nankang for the trailers (other is a car hauler). I have used both trailers with these tires,and have very good results in dry and wet road conditions, including cross-winds, with the Nankangs.
After the trouble people have had with Fstone and with Gyear Marathon (trailer tires), I don't see a major advantage to one source over another.