Beer Can -
You might want to search this board for "LT tires" or "Special Trailer" - there are several long threads about the difference right here in the Tires Tires Tires forum. Or just go to a tire manufacturer's web site or an RV web site and read up on the difference. They are not generally considered to be interchangeable, although some people do use LT tires in place of ST.
Bill
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