Tekonsha 119191 ModuLite HD Plus...
https://www.amazon.com/dp/B001P2DUM2...p_mob_ap_share
That's the one I used for 4-pin. It does a perfect job at what it's meant but I do want to get the bmw solution so the car will factor a trailer into dsc and not beep constantly when backing up etc.
Anybody know a source for the correct module for 2011 e70? I found for other years not 2011.