I did some searching around and found this page:
Konabob's Taro Patch Steel Guitar Home Page
Granted the guy's making steel lap guitars, he makes it sound like the tuning is all that matters.
He keeps saying "Taro Patch tuning," at any rate, so it seems like (D-G-D-G-B-D) is the way to go.
He also mentions an open G tuning (D-G-G-G-B-D), G6th (G-D-E-G-B-D), and a reenntrant G6th (E-G-D-G-B-D). I still have no idea how this would even work, so you might try emailing Kona Bob and asking him to elaborate. His email and phone number are at the bottom of his page.
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