Yeah, I briefly looked for documentation supporting that, but couldn’t find it. EU owner manual still doesn’t mention, and epg doesn’t show a new connector on the rear harness. Do you have anything that points to details?
I wonder if any european owner using trailer already in M3 could tell us where this red wiring is going on the rear trunk. Is clear is going from the VC-left to any rear point (laying from the left side doors down) , and the cable is very evident to find so it seems is the only one with this size (seems 14AWG) going to rear with big black tape package with other small cables less thickness.