Brink to the rescue - click on the link below
https://brink.eu/en-gb/towbars/brands/mercedes-benz/glc.html
https://brink.eu/en-gb/towbars/brands/mercedes-benz/glc.html
I just drove a loaner with an auto lift and a tow package installed. No problem.See my post on the Factory tow bar. I think I've figured it out.
http://www.glcforums.com/forum/106-...69-great-us-factory-towbar-hitch-debacle.html