Hello, now I can look forward to my Christmas present at the beginning of the year. Just in time for Christmas, the air suspension in the back was slippery. Will say: He squats in his knees if he is standing for a few days. In the first shot I would have tapped on the bellows, but since both sides of the rear axle are affected, I think that is unlikely. But in the front everything is ok. In the back the driver side is slightly more affected, i.e., he is sagging a little faster, but basically he sinks on both sides of the back. Does there have an idea about what is common to both sides of the HA, but does not concern the VA?