Fat Frank and Velocity Dually Rim Question

[The Black Monark]

I'd like to try a set but with price, shipping, and restocking if they don't work:
I'd like to know what the width of a Fat Frank is when mounted to a Dually.
Any help?

 

[Bicycle808]

Not sure, be before you proceed, what hub will you use out back? I've yet to see the Dually offered in any drilling but 32....

 

[The Black Monark]

Not sure, be before you proceed, what hub will you use out back?

velosteel