I had a tow bar fitted at the dealer and have just tried to use it for the first time. The plug was actually impossible to access - I had to loosen the nut and rotate the plug connection down so that I could actually access it. The plug was quite difficult to fit in and then the biggest problem is that the adapter that fits this plug has a black rectangular box in the middle of it which is not attached to the car and of course not attached to the trailer - so now I have a 1m cord connected between my trailer and my car with a heavy black box attached. I guess I could duct tape this to the trailer but seriously ...?

Cars & Trucks - BMW - X5 Series