I installed the 3/4 rack in June and I love it. You can do so much with it and I love that anything can be bolted to it. I don't have anything negative to say about it.
I have 285/70/17 bfg ko2 on stealth custom series wheels. I also have a 2.5 inch icon lift. Mine only rub at full turn in reverse. They would def rub without the lift.
I'm at work or I'd measure mine. My parking garage has a 7ft clearance. I have the same lift set to 3inches. I have bfg k02 285/70R17. Mine fits in the garage with a few inches to spare.