The Trac Grip M/T R408 from Thunderer is a mud-terrain tire that's built for use on light trucks and SUVs. The Trac Grip M/T R408 is designed with an extra-tough tread formulation, high-void tread pattern that easily ejects mud and debris for enhanced traction, up to 12 ply rating, an innovative mix of open and tiered tread block elements, and your choice of black letter or raised white letter sidewall.