I think the first thing is that you should probably get over the Internet hype around China Bombs. It is virtually impossible to avoid stuff made in China these days and doing so is definitely NO guarantee you will get a product that is functionally better.
I suspect that most of the hype is undeserved blame shifting. When you run a tire overloaded (quite easy to do actually...), beyond its speed limits, under its proper air pressure for the load, or any combination of these you are playing with dynamite and really should not go blaming the tire if something goes BOOM!
With a 7000+ lb trailer running ST205R14 tires i do understand wanting a bit more safety margin though. So here are a couple I have my eye on:
I have always gotten great service from these folks:
Karrier ST205/75R14 Radial Trailer Tire - Load Range D Kenda Tires and Wheels AM10235
I bookmarked this one from an earlier post for when the time comes:
ST205/75R14 LRD 8 PR Kenda Karrier Radial Trailer Tire
You can find other suggestions here if you search and have a bit of patience to wade through all the China Bomb hype