This looks like a cheap solution:
7-Way to 5-Way and 4-Way Trailer Adapter for VW, Audi and Porsche Towing Trailers with LED Lights Valley Wiring V39008
7-Way to 5-Way and 4-Way Trailer Adapter for VW, Audi and Porsche Towing Trailers with LED Lights
Code:
V39008
Price:$14.95
Shipping Weight: 1 pounds
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Valley Wiring - V39008
Designed for use with 2007+ Volkswagen Tourareg, Audi Q7 and Porche Cayenne when towing a trailer equipped with LED lights.
Valley 7 way RV style adapter to 4 and 5 pole flat trailer connectors
- Designed for use with 2007+ Volkswagen Touareg, Audi Q7 and Porsche Cayenne (or any vehicle with a factory specific 7-way plug) when towing a trailer equipped with LED lights
- Plugs into a 7-way connector on the vehicle and 4 way or 5 way flat connector on the trailer