Most people that suffer RV trailer tire failures also harbor ill feelings about the brand that failed.
I'm not offering any recommendations here. However, Trailer King does get on a lot of top ten lists.
Tire failures on RV trailers are often a product of misuse. All trailer tires degrade rapidly when constantly being used at or near their load limit. Were yours providing 10% or more of load capacity reserves when they failed? The only way to know for sure is to have a weight slip from some scales that verifies what the tires are actually carrying.
This is a sort of model specific forum (Keystone). Keystone has always been very skimpish with their trailer tire fitments. Sometimes providing tires that have a maximum load capacity equal to the maximum load the GAWR axles are rated for.
Here is a picture of a vehicle certification label/tire placard I took at a RV show a few years ago. It shows just how skimpish the tires were for that trailer's fitment. Max load 3520# tires on a 7000# certified GAWR. ( http://www.irv2.com/photopost/showfull.php?photo=27420
Here is a Tire King reference listing all their Radial ST tires. All have the "M" speed letter. All 15" LRE and above have Nylon overlays. And, they have added a LRF to the ST235/80R16 size designation that has a load capacity of 3860# @ 100 PSI. They also have a very generous 5 year warranty period.
The China tire manufacturers are very fast in meeting new tire industry demands. Take a virtual tour of one of the larger, well established ones. You might be quite impressed with their equipment and technology.
Again, I'm not supportin/recommending anything here. I'm just sort of saying, be open minded about your tire failures. All of them have a cause and those causes are seldom described when members here report failures.