Mud Terrain tires are a fool's choice if the truck sees ANY contact with pavement. Try a more well rounded design, like BF Goodrich Land Terrain in a P rated radial. Good, self clearing treads in mud and snow, and excellent longevity on pavement if rotated every 6k Miles. They are dead quiet on the highway too if kept aired up to about 35 PSI on your average Blazer 4x4. (They'll go 50 - 80K miles easily, depending on how you drive) Mud Terrains are made out of bubblegum for traction, but wear themselves to NOTHING on the streets in under 10K miles. Not ot mention they sound like a Tonka bulldozer on the street. Hope you don't have expensive dental work...*BUzzzzzzzZZZzZZZZzzzzZZZZzzzZZZZzzz*