He's filming in his van because he isn't yet ready to admit to his wife that he is stark raving mad.
I agree with some of his points. Modern agriculture treats soil like a suspension medium for NPK but w/o good 'ol Fritz Haber (when he wasn't being a bastard) there's no way the Earth would pump out the calories to keep us going. These survivalist guys, although they have a really daring sense of fashion, never address why the current system is doomed to failure in the, like, immediate future. I mean look at this guy. His biggest survival concern is his grapefruit prostate.