From their website.

The Discoverer S/T is Cooper's premium all-purpose SUV/light truck traction tire that is a hybrid of three designs — all-terrain, high void and commercial traction. The Discoverer S/T fits a wide range of SUVs and light trucks up to 1 ton, but it is especially suitable for high-powered, high-torque light trucks where optimum wear and traction are required.
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