I recently purchased an aluminum 20' trailer to haul my track car and use my wife's X5 3.5d to pull it. The Prodigy wireless brake controller worked great for me and took about an hour to install and program for my specs. Much better option than the $1,200 my dealer wanted for a hard wired unit.

However the trailer lights have been a struggle. My brake and turn signal lights work perfectly but after a few minutes all the running lights turn off. I've now read all the postings on the LED issue with the X5. Seems like the lower resistance of the LEDs is a problem for the X5 systems. I've since discovered (better late than never) that I need a 7 pole to 7 pole adaptor to make the LEDs work with an X5 (similar issue Porsche and VW SUVs it sounds like). However Valley whom manufactures the adaptor apparently is out of stock with no eta of when the V39010 will be available again. The X3 forum has a posting in which it looks like the oem VW adaptor will serve this purpose.
http://www.xoutpost.com/bmw-sav-foru...ing-hitch.html

Has anyone successfully used the VW adaptor (or the Porsche unit, which apparently exists as well)?

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2013 Cayenne GTS Basalt Black/Alcantara (Wife's Daily Driver)
2013 Porsche 911 cab Aqua over pebble and agate (My daily driver)
2010 Porsche GT3RS Black Grey/Black Alcantara (Track car)
2012 Porsche CaymanR Peridot Green with carbon sport buckets (Wife's Track car)