Years ago,Sean @ +++ LORENZindustries - Dodge Performance Suspension +++ supplied some of his 23%+ coils for my '07. They proved to be too stiff even with my camper load. I sold them to a guy in upstate NY who plows and he was pleased. They were a 2" lift coil. I don't know if Sean offers anything for the 4th gen trucks.I plow. Don't think those will work for me. Crud...