Trailer tires - what are you running?

On stock trailers I rn 10 ply. Keep air pressure correct is a key. On car trailer I have run it all, from car may pops to new ST trailer tires. 15 inch. I just made trip from old home of Missouri to Tx 600 mi one way with car on trailer. I called local tire store and ordered the absolute cheapest 4 of 6 ply ST tires they hade 225 15 ST, total was $239.00 Made it home great!
Last year one trip with the 500 mi trip with loaded stock trailer, I blew a good but older 10 ply. I stopped at store and replaced with a new 10 ply ST. Got home OK but later noticed it had slow leak. Had pin hole in side wall. Yep, made that way in CHINA!!!! So is life. Why expect more?