While driving over bumps the car was shaking and when parked the rear of the car dropped dramatically and the sensor prevented driving. Is this a Mercedes air suspension problem?

There could be two possibilities in this case. First the Mercedes air suspension can drop when the car is parked for a few days because the air in the bags tends to seep out. However it levels once the pressure in the pump normalizes. On the other hand, there may be cases of updated pumps which do not provide sufficient pressure, preventing the system from rising completely. There are a few recalls of these and the local dealer would be able to provide more information whether the faulty component is present on this Mercedes car. The other possibility could be leaking rear shocks which can cause noises from the rear and make the car shake as well.