Don't be afraid of the sawzall.
It's probably hard to tell, but I did do some trimming on the inside fender wells. My friend Txplates has the same tires on his ST with only the 3" body lift. No torsion twist and no lift shackles. The right backspacing on the wheels is important.
This is me driving Txplate's ST down a hill. He's still learning and preferred for me to take his truck down the hill. He had his anti-sway bars still connected which gives you no flex on the rear axle and makes the truck roll and pinch way more than it should. Driving his truck was way scarier than driving mine down the same hill. Take note, you can hear his tires rubbing sometimes. But, it's not that bad. They definitely don't rub while driving on the street with normal driving.
http://www.youtube.com/watch?v=dO-0omMn7Ns
Here's me driving my truck down the same hill...
Note *** - I have a spring over axle lift and Warrior rear lift shackles on my truck in this video and no anti-sway bars.
http://www.youtube.com/watch?v=8pji9OKFrX4