It seems like a van is not the best option for van dwelling, despite that "van dwelling" contains the "van" word. Most vans are not all-wheel drive. Few of those AWD or 4WD are usually very expensive, rare and difficult to get especially at the used cars market. Mercedes Sprinter and others mostly are 2WD.
Like a van, such truck body has enough space to fit dwelling and bed space for 1-2 persons. Unlike a van, in addition to 4WD (or 6WD like at the picture) this vehicle has better ability for off-road, bigger wheels, an option for a winch.