For fuel economy, the TDI is the way to go.
How heavy is the trailer? I have no experience towing, but friends who tow tell me that a long wheelbase aids stability. Those who tow somewhat heavy trailers tend to prefer the large GM and Ford SUVs. The Dodge Durango is one in-betweener, longer than the Touareg but not nearly as bulky as the big ones. The related Jeep Grand Cherokee is offered with a diesel, but it's also similar in length to the Touareg.
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![Volkswagen Touareg](https://www.truedelta.com/images/ext_photos_250/2015-Volkswagen-Touareg-exterior-4.jpg)
![Dodge Durango](https://www.truedelta.com/images/ext_photos_250/2021-Dodge-Durango-exterior-8.jpg)
![Jeep Grand Cherokee](https://www.truedelta.com/images/ext_photos_250/2022-Jeep-Grand-Cherokee-exterior-10.jpg)