The reason I ask is because when I was looking to buy my last set of tires I asked a couple of different shops about LT vs ST. Everyone said buy ST for a trailer, but when questioned, they all admitted that ST tires are not tested the same as a vehicle tire. They don't have the same standards and don't have to perform like a vehicle tire. Since you don't ride in the trailer, you don't have the ride experience that you expect in a car or truck. Fortunately, my trailers fall within the weight range that I can use an LT tire and that is what I choose. But, just thought since this is such a controversial topic on these threads, to ask, how are they tested?