Vibration G350 BT, does anyone know the problem?

Dear G-Friends, I need your help! I drive a G350 BT, built 10/2013 and 11/2013. So it is the Mopf model (spring 2012), which was revised again for the new model year 2014 due to some problems during the factory holidays in the summer of 2013 (e.g. larger oil tank and reduced maintenance intervals to 15 Tkm). Already after about three months the G showed vibrations and hums in certain speed ranges. This occurs especially with low partial load and in the Sc The steering wheel and pedals then vibrate, the whole car as well, as well as a hum from time to time, on the driver’s seat it is much better to feel than on the passenger seat. In the meantime, the G was three times at the dealer for revision, incl. twice support of a factory employee. It was here Changed to the distribution gearbox, the drivetrain relaxed, as well as the bearings of engine, transmission and exhaust line renewed. Result: only slightly improved, but quickly restored old condition with the above mentioned vibrations. In the meantime I got it back, unfortunately without solving the problem. I can’t understand the hint from MB that this is normal for a real off-road car with ladder frame and distributor drive. Is not my first ‘real’ G After a joint test drive and the statement that the problem is easy to feel and reproducible, the service employee from the factory probably caught another demonstrator for comparison, who should show similar symptoms. Therefore, this would be the current standard of production. I will not let that stand (the legal position on my part regarding change etc. I know udn will act accordingly, if there is no solution), me But first of all it is about the question to you whether one of you had similar problems and whether and above all how and by which work these could be solved, so that I am better equipped in the following negotiations with MB. Basically I do not want to give the G at all, because I like to drive it very much, but without a solution to the problem I will have to bring about a solution. In advance many thanks for your help, greeting to the congregation of Markus