Okay, I know someone has done this before. Dave Baker perhaps....

For camping, there are some campgrounds that I have been to that don't
allow the user of generators (well infernal combustion ones at least.)
I acquired an Air-X wind turbine and now am pondering how neatly I can
route the cables into my Westy. In an ideal world, I'd have a plug on
the outside that would simply connect into my batteries on the inside.
Maybe by replacing the fresh water intake port, or the water tank fill
up spigot.

I'd really like to get this operational for this year's camping season.