If you haven't purchased the Cayenne, find one with the tow package already installed, it will save you from major headaches. Heck, when I bought a trailer with it's own brake system I had to go through the hassle to get a controller put in by someone other than the dealer that sold me the trailer. They tried, but quickly gave up when they realized that the install was a delicate matter and referred me to a dealer that specializes in Porsche installs. They still don't have my winch working. Patience.
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