In the past six years I've had five tire failures on ST tires on my trailer. I've incurred over $4000 in trailer damage from these ST tire failures. I'm religious about inflation, weight and speed maintenance as well as tire temperature, using an infrared thermometer on my tires; I now using a tire pressure monitoring system which also updates me on tire temperatures.
In that same time period I've had absolutely NO tire failures on any of the vehicles I've owned over that same period of time.
My conclusion, like most of the rest of people here, is that ST tires are a bad choice. I'm happy with my Uniroyal LT tires. And as mentioned previously practice outweighs theory.
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