You hit the nail on the head with this one. Do I believe the Chinese will make lots of substandard tires, yes. Especially local Chinese companies who make either private label or off brand trailer tires.
However, because I've seen so many folks pulling TT's down the interstate at very rapid rates, I also firmly believe many of those folks who complain about poor quality China tires, are abusing the ones they have.
Much easier to blame a "poor" quality Chinese tire, rather than acknowledge they were consistently pulling at 70mph or better, hadn't checked the air pressure in forever, hadn't checked for cracking in the side walls and had over loaded the trailer.
What I don't understand is why Goodyear allowed poor Chinese quality control ruin their name.
It's one thing to have a local Chinese company build tires without GY QC supervision. It's quite another to build tires in China with Goodyear salaried QC people in charge.
Probably another cost cutting blunder.