It's been a long while since 'cattle cars' were legal here. Even on U.S. military bases, they're no longer allowed, only buses/motor coaches.
From above.... I'm reposting this to mention that there's a guy over on the Garage Journal Forum, who found, and bought a Crew-Cab version of one of these, and he's restoring / resto-modding it right now. Should be a VERY cool truck when he gets it done. Here's his project thread: https://www.garagejournal.com/forum/threads/1966-n700-crew-cab-found.480664/