The harness works fine. While in England I bought the OEM harness for my W210 (which MBUSA also say "cannot tow") plus a trailer-side 13 pin plug. I wired the 13 pin trailer-side plug to a US car-side flat four. My local stereo shop installed a logic box to deal with the separate blinkers for <$100. This I could do again no sweat.

The receiver is a bigger problem. All I can do then is go for something from etrailer.com and they have ratings of only 3,500 lbs. That ain't gonna do my race car. So close....

Grrrr.