It makes sense, however, if you are looking at 1) voyaging more than anchoring, and 2) looking at wind as the secondary house battery charging input after solar.
I get the impression that the Duo-Gens, while not optimized for high output at low-moderate wind speeds, work quite as well as any other in decent wind. This means on a sunny, windy passage (or a windy night passage), you're going to make a decent amount of amps. On a motor passage on a calm night (or a sail passage on a cloudy day, I suppose), a towed generator is going to make a very impressive contribution akin to having another alternator.
The towing option is attractive in many ways, but it's something for the more active voyager, not the Margueritaville mooring field type...not that there's anything wrong with that.