How much air pressure are you running, are the rims the correct size for the tires?? Air shocks do not promote good handling, try some gas filled shocks. Get your springs re-arched if you are using the air shocks to raise the ride height. Ladder bars and housing floaters will take the wheel hop out of the truck. Are you sure the vibration is tires, or is your driveshaft out of balance or maybe a bad U-Joint???