The only place the tires rub is on the swaybar, but thats normal for these trucks when you put bigger tires on them. I had the trucks wheel wells cleaned up at a custom shop for clearance for the tires. I am beginning to believe that not only is the weight and size of the tire messing with the steering but my tie rod angles are adding on top of that.
Well, for starters, you don't want your tires rubbing on anything. Some guys let it go because they only get it when their wheels are cranked all the way and their backing up or whatever, so a rare occurrence.
Furthermore, it doesn't matter WHERE your tires are rubbing, if they grab WHATEVER hard enough it's obviously gonna grab the tire and pull the truck to that side so I definitely wouldn't dismiss this.
Lastly, it sounds like you just had this done? I had a Jeep that I bought the tires for(lifted it) from America's Tire, and they let me return the first two sets I bought because I was a finicky bitch.
I don't know where you bought your tires from, but it would definitely be worth it IMO to see if they have the same policy, and back down in size if they do. No matter what, you're running tires that are WAY too big for your leveling kit.
Oh, and I don't remember reading whether or not you contacted Rough Country regarding this? I coulda swore several people on here chimed in with your same kit and said they aren't having the same problems, which would take what the installer wants to do out of the equation.
Rough COuntry's ENgineers designed this kit, and I'd be willing to bet that if you contacted them and gave them all the parameters(maybe take pictures of your suspension pieces, and obviously let them know both your tire AND wheel sizes), they'd be able to help you. They call for a 17" wheel for this kit. Maybe a 16" WILL work, but I know on the 6" lift they call for an 18" wheel because anything smaller WON'T work