Barlow Jeep Rentals in Sedona, Arizona, who really know Jeeps, have their Rubicons lifted 2 inches with stock tires and no problems and they look great. Bigger is not always better for tires, though. Depends on what you plan to do. Their Jeeps deal with some serious mud and rocks. But if you want to spend the money and deal with gearing issues, geometry, etc. go ahead. Just be aware that one thing leads to another. Do your homework in assessing larger tires.