Michael McNulty wrote:

From what I've read, while Mercedes does give a tow rating for many of their
cars sold in German, they limit the speed while towing to either 55 mph or
62 mph (100 km/h).

It's not Mercedes. It's simply the law which limits the speed for
trailer towing in some countries. (e.g. 80 km/h in Switzerland, 100 km/h
in Germany ...)

Stefan