I ran into the folks above camping at white spar campground last weekend in Prescott. As a side note there is a super-fun MTB trail from that campground out to Senator Highway and Goldwater lake.
They are Alex and Ans from Holland. They started out with a mid 2000's SMB 6.0L that they used quite a bit but had numerous 6.0L issues and power top issues in sub-freezing weather...they have apparently trekked around in the artic at least once or twice for a few weeks at a time.
So they sold the SMB and ordered this 2015 cutaway from SMB Fresno and built the box on the rear. SMB did the 4x4 conversion. The box is fabricated from aluminum angle, channel and .032" sheet backed with plywood. SMB Fresno supplied water tanks, and numerous other goodies as they were interested in this project.
Alex and his buddies fabricated the whole thing....rear bumper, etc. It's a V10 with a gasoline espar hydronic and flat plate, 360W of solar 400 ah of batteries. The cab is painted with line-x all over, and the bubble fairing was sourced in LA from a manufacturer that makes them for E series based shuttle buses. he said it took him three months to build..which seems a bit super-human...They also fabricated a custom fuel tank as well.
They are presently living in the rig...just sold their CA house and are looking around AZ.
..a few interesting things ....they had originally screwed the ceiling panels into the outer shell, but have since changed over to plastic Christmas tree type fasteners after waking up in the artic with icicles hanging from each screw inside the camper. They also have heated windshield wiper blades..
One more picture...they fabricated lots of outside storage cubbies out of aluminum and also lots of underfloor storage.