I did a few searches in this forum to see if there were any posts on towing an ML350 4 down and could not find one. Anyone out there doing it and if yes what equipment are you using ?
I would not take anyone on this forum's advice on this question (no reflection on members of this forum). The only place to go is in the manual in the car. If you still have questions, go directly to Mercedes and get the information "straight from the horse's mouth".