I have it on #7 and got exactly 2” out of it on my Non-ORP/non-air bighorn. I do however have a pretty hefty front bumper on the truck which brings down the front end a touch. Had to remove splash guards and still have a slight rub at full lock on inner wheel well liner that can be remedied easily, I’ve just been lazy.
Overall, I drove it with my stock tires for a couple days and it was vastly improved on road and off road. Firmer? A little, but not in a bad way or in a very noticeable way. Just felt more planted and stable.
Then i threw on 35/12.5r20 load F ridge grapplers and now it rides like...well...a truck. I feel the small imperfections in the road now, but medium to bigger hits are fine.
Point is, the 6112s are hands down a vast improvement over stock. But do not expect to keep the limo ride quality we have if you plan on going 35s or similar.