See right now i am using 305/45/22 and really dont want to have to buy new tires. The bottoming out is only in the front but the rear tires are hitting the inside of the fender peeling the outside of the tire. When it rubs you cant hear it and it only happens when i come off a big dip in the road making the truck sit higher in the front. As far as the ride I have considered air assist but wasnt sure wich route to go. How much does the kit run? Right now my main concern is me looseing these tires to this problem.