I know this thread, as do all "tire" threads, has taken some weird turns but I wanted to say that our 5th came with 15" Power King Towmax STR tires and they are still alive after at least 15,000 miles and 3 years of service. Not one flat or other issue. Some scrubbed off shoulders now which is typical of ALL trailer use tires from turning. So, not every Chinese made crappy tire will be problematic. As with any group who participates in specialty forums, whether it's for RVs or coffee makers (and yes, there is one) we all read about the worst case scenarios.
My point is there are probably thousands of these tires rolling along the highways and byways without anymore issues than any other tire.
That being said, even with tire life left on my Towmaxs, in planning for a significant increase in long distance travel this year, I swapped out my OEM setup for new 16" wheels and LT tires for some piece of mind because this place and the other RV forums I am on, had my worked up into a panic :)
Just my .02 cents and YMMV :)