The passenger/right side of my 2000 S500 is a little lower than the driver's side of my car, more so on the rear side. If I leave the car parked for a few days, the car looks like its tilting to the right by about 2-3 inches, only to have the compressor even it out while I drive it again. Could this be a strut problem or something else? Also could this be related to a knocking noise I sometimes hear on the rear passenger side of my car when I go over uneven roads?