Maxxis ST tries are manufactured in Taiwan with stricter quality control and specs; which is much different than Chinese built ST tires.
They have the best reputation the RV forums I hang out on. If I was going to use ST tires, they would defineately be Maxxis.
BTW, regardless of which tires you get, be sure to have them balanced; if if you don't already have steel valve stems, get them, too. You'll thank me later....
2013 Palomino Columbus 320RS
2007 Dodge RAM 2500 6.7 Cummins
Reese 15K manual slider
M.I.L. in Florida for good!!