Tires are rated by sidewall plys. From lightest to heaviest (duty/weight carrying). SL, XL(4 ply), C(6ply), D(8ply), E(10ply) and F(12ply). SL are most cars and SUVs. XL for heavier SUVs and light duty pickups. Then you start getting into the heavier sidewall tires. Ford Raptor is stock with C rates tires (6 ply). Generally speaking the softer the sidewall, the better the ride. But you give up some strength. If it’s primarily street, you’re perfect.