Anyone know if it's mechanically possible to adjust something in the front end/ steering components to prevent my wheels from turning too far in one direction?

I know this seems to be totally opposite of what people look for (high turning radius) but i'm having a problem of my new tire/ wheel combo rubbing the lower a-arm when completly turning the steering wheel in either direction such as making a tight turn into a parking spot or u-turn.

 

Do you really want to be messing with the steering system? Why not just refrain from turning lock to lock? Is this from improperly backspaced rims, or just too much tire for the truck?

 

The Terra Grapplers are just a bit too wide for mine.