i am having the same problem with my 01 allroad... the suspension is sagging in the front end, but only when driven and then parked while in the lowest setting. the dealer has been unable to recreate this, but it's happened to me several times. the airbags don't seem to be leaking...
Also, in a separate suspension issue, when i go over any repetetive jarring bumps or truck ruts, the right rear of the car will bounce off track. this can be quite unsettling at highway speed, and there are a lot of rough roads around nyc's highways. the shocks and airbags seem to be functioning properly, and i believe the shocks/struts bolt right to the frame without any bushing or bearing, so that can't be a factor... it doesn't matter which tires are on the car... even brand new ones. is there anyone else who has the same feeling with the car, or perhaps knowledge of any potential wear bushings or bearings in the suspension that may be a factor in this symptom? the dealer can't recreate the condition, and they think i'm crazy...