What is it with retired Germans and their million dollar 4×4 commercial truck based RV’s that look like they’re outfitted for the apocalypse?

I live in Alaska, so popular place for tourist. I see at least one of these a day with, almost always with German EU plates, and never see them the least bit dirty. They all look like this. I haven't seen one with a French plate, I haven't seen a Slovak plate, I haven't even seen a British plate. What gives?