IMO the whole "China" thing is vastly over-blown. Virtually all ST trailer tires are made in China. So, it makes sense that virtually all tire problems will be with Chineese tires. Unless you have a Tire Pressure Monitoring System, you don't know if your tire is going down (say due to a road hazard) until it is too late. Then the tire shreds. Then it is a darn Chineese tire!! By then the evidence is long gone.
So, IMO, don't worry about. Here are some keys to success
1) Don't exceed 65 mph; the rated speed for an ST tire
2) Don't overload; never exceed your trailer GVW, it is best if your total tire weight capacity exceeds your trailer GVW by 20% if possible
3) Make sure your tires are inflated to maximum pressure indicated on the sidewall
4) Make sure your trailer is weight balanced; side to side, 10 to 15% tongue weight
5) Make sure your trailer is level when towing; this puts an even load across tandem axles
6) Replace your tires every 5 to 6 years; even if they look fine
7) Check tires/temp at every stop
Consider a TPMS. You can get a good one for about $250. Then you will know if a tire is going down before you have a blowout; some will tell you if your tire is over-heating as well.
Tire issues do occur. Tread can separate etc even if you are doing everything right. But I wouldn't get overly concerned. I would venture that most of the time 1 or more of the above "guidelines" is being violated or an undetected road hazard has occurred.
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