Re: Porsche Cayenne towing wiring adapter
Try a U-haul truck and trailer rental center.
Personal experience... Do not let U-Haul or anybody else do any wiring on that vehicle. They seem to do passible on the "normal" vehicles, but they really screw up anything that they have not seen before. Personally, if I had that much money in a vehicle, I would either do it myself or buy the right stuff from Porsche.
Years ago, I let U-Haul put a wiring harness on a Ford Probe. They screwed it up and I had to take it to the dealer tom get it fixed. At least they admitted they screwed it up and paid for it, but I had to take it to the dealer myself. I also let another chain put a harness in a Saturn Wagon. They did not even know they screwed it up until I took it back and made them fix it.
Now if it does not have a factory adapter, I do it myself. No more paying for someone to screw it up for me.
TerryMSU