Errrrmm,,,,,,,,,,,,,I "think" if you looked at my reply to the OP as to where to look for the very long, very technical replies, it just may have twigged with others that the topic has been talked to death elsewhere.
Lutz managed to get the gist and referred the OP to the particular topic too, but aded some informative info about the Merc as a towcar.
It was only when it appeared that it was going down the same road as the original topic in Technical that I locked it for that very reason.