Quigley doesn't do an AWD but the NV is single speed with a 2wd or 4hi transfer case. I think the missing element is 4lo which they appear to be working on. These single speed units have been around for a couple of years.
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2015 Chevy Express 3500 Duramax
w/ Quigley 4x4 & Agile Fox shocks
Sold 2005 E350 Chateau
Quigley with Agile RIP, 6.0 PSD
There are two Nissan dealers in Utah that convert the NV to 4x4. One of them uses all Nissan parts from the Titan XD with 4H and 4L. I picked one up not to long ago and love it. Not to much available in the aftermarket parts though. Avatar Metal Works and Aluminess seem to be the only ones making off road accessories. Maybe Sprotsmobile wants to get back in the NV game?
Not to add more to an old thread, but nissan just announced they're ceasing production of the NV vans... so unfortunately, I doubt much more aftermarket support will develop.
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2003 E250 Full Self-Build
2009 Honda Element "lil' toaster"
2013 Suzuki DR650
Santa Cruz, CA