I currently have a 2004 Ford F-150 FX4, 5.4 L, all Stock. Current tire is stock 255/70R17. Its time for new tires. What is the biggest tire i can get with out changing anything? Can i get 31's or 33's or only the stock tire is possible. I want no rubbing, damage, etc... Also i am probably going with firestone, Bridgestone, or Goodyear since they are right around the corner.