Hi Atlas CA,
Congratulations and welcome to the Airstream community and forums!
We had a 2016 VW Touareg TDI and a FC23FB. I bought a Tekonsha Prodigy P2 from eTrailer after finding their installation video on a Touareg.
I'm guessing yours would have the VW factory brake controller connector tucked under the dash. eTrailer shows you how to make a pigtail using the VW parts connector and wires at the 5:20 mark. This makes it simple to connect the Prodigy.
Here's the eTrailer page: https://www.etrailer.com/tv-install-...reg-90885.aspx
By the way, the connector under the dash was wrapped in white foam. I did have to drop the lower plastic panel and lay on my back to get to the plug.
The controller worked great; just make sure you set the gain by testing on a quiet road of parking lot before heading out. You should feel the trailer brakes engage when you manually engage the lever on the controller.