I have seen and read the discussions regarding the possibility of adding air leveling for the rear suspension (ie optional on limited with XREAS), but I have not seen a discussion on whether or not you can add a four wheel air lift susp. My thoughts are this will be incompatable with the XREAS, and may be incompatable period, but I thought I would through it out there. I was thinking of something similar to the system on the VW Taureg. Maybe this is just a pipe dream, but it would be nice to have some increased lift on command, while being able to lower it during day to day driving. Let me know what you all think.:dunno: