So while I have as much love for this van as the next guy, why not a US solution? If this is the perfect size/layout platform why not just go with a Grumman stepvan?
Oh, well, that's a really fine question, but a bit of apples to oranges. Stuart/Maureen's van has a passenger seat, a normal passenger side door, a front footwell for the passenger, more appropriate gearing and better suspension and ground clearance. Some of this might matter and some might not. Same with the 4x4 setup, though that is, however, one of the most special things about the van.
The step van might be just a few thousand dollars to buy used, but the build-out and the expedition equipment of the 814 would cost tens of thousands to replicate, particularly if you count your time for anything. After all, there's a whole book written about choosing and installing the systems and equipment for this camper, so I think you can safely assume it is comprehensive and well chosen. And if you did want 4x4, there's a considerable additional expense. If you do the work yourself, that would save some money, but Quigley and their competitors get something over $12K to do a comparatively straightforward conversion of an E-Series van to 4WD, so I can't imagine any commercial shop would engineer and install a one-off for less.
Just as Mog was not slamming the Mercedes, I've got nothing against the step van concept. In fact, I have spent dozens of hours looking into the feasibility of using them in lieu of the smaller and harder-to-build-out Sprinter. I just want to make sure people will be adding in the considerable costs involved in trying to make any step van into an expedition truck with anything like the capability of this 814.
And FWIW, if anyone is pondering this general form factor, you might consider starting with a used tool truck. They are routinely spec'd with better engines and running gear than the delivery vans, though, not surprisingly, that's reflected in their price. Check here:
http://www.tooltrucks.com/classmain.php
for about a hundred examples.