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This happens every time this subject arises! And no one ever touches on the most important data in the answer.
Firestone E rated truck tires' weight ratings are at 106 mph. Other LT E tires may be even higher. An ST E rated tire is load rated at 65 mph. This means that at 65 mph an ST tire's load capacity is maxed out and starts diminishing as speed increases.
Understanding how important this speed/weight rating is, is more important than where the tire was made when determining capacity. At 65-70 or even 80 mph, an LT tire is not near is's load capacity.
The import issue is also important to me. I have always been able to find US made LT tires for my Montana.
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