I don't run anything but Maxxis on my RV and boat trailer. They are the only ST tire that is not made in China. The higher rated ones are either 8 or 10 ply. Lots of people also forget that trailer tires are only rated for 65 MPH. LTs are a better choice if you can find them in your size, I couldn't.
2015 Seaark 1872 MV CC Etec-90
Two Helix 12 CHIRP SI's, , MinnKota Riptide ST80/i-pilot Link, Bob's Hydraulic
Bitter Gun Owner