Have you though about Maxxis ST tires? they have the only ST tire not made in China and have a good reputation. The load E can easly handle the weight of your trailer.
I have them as the upgrade option on my new Wildcat, I had also put them on my previous Trailer.
-2013 Ford F250 XLT 2wd Crew Cab 6.2 with 3.73
-2015 Wildcat 317RL
-B&W Patriot 18k, MorRyde, Timbrens