Ok I know there are the TSLs, SSRs, TSL SX, Radials, What are the differences between these tires? I know the basic difference between Radials and bias ply, but if anyone knows why there are different types, I would love to know. I am planning on buying some new 37-38" tires in the next couple months. Looked at the MTRs also. Any help would be appreciative. Saw a couple things on the search but nothing really helpful.