Re: What tires really fit?
Yeah, the 255/70/18 I have on mine are probably the biggest diameter (32.1") you can fit, and still use all the settings of the air suspension without rubbing. In Park Mode it's very close, but there's no contact. I suspect Aero Mode will be pretty close too since it's about half way between Normal and Park. I think if you went any larger, you'd likely have potential rub when going over bumps/holes in Aero Mode.
You could probably go wider in the same diameter, with something like a 275/65/18 or some other combo, but I'm not sure. Someone may be a little more help, but I just wanted to point out that with the same suspension you have, on Jeep 18's (from a Wrangler), it's very close with my tires that are 1/2" smaller and a little over an inch narrower. I suspect the extra width and diameter of the tire you're considering may be too much.
The sheep generally do not like the sheepdog. He looks a lot like the wolf. They would prefer the sheepdog cash in his fangs, spray paint himself white, and go, “Baa.”
Until the wolf shows up. Then the entire flock tries desperately to hide behind one lonely sheepdog.