Speculation the AT4X will be the Ultimate version of the trim level? Possibly black-out? More of an off-road tire. Will you be happy with the stock wheel/tire package? That seems like it might be part of the upgrade cost to the X. I agree likely higher clearance than the AT4. BTW I love the white AT4s.
Curious on your setup. What size lift do you have? Is a specialty shop needed to do lifts? Interested in adding one, but not sure where/how exactly to find one. Also, any re-calibration of the cameras required after the lift?