Tire tread wear.
Is it normal for tires on a 5'ver to wear evenly across all threads. Or, because of scuffing and being ST's will the outside threads wear faster then the center. Giving a slight "football" appearance.
Forum Discussion
I've never had ST tires on my trailers. The LT's that I use wear evenly and the current ones are almost 4 years old and still look new.
