Had I just seen the picture, my first thought would have been Woodbury. I like the super clean van (the show always has clean-clean cars).
I've read the Walking Dead from nearly the beginning until a few months ago.
very cool diorama Babar. I do think you need to dirty up the vehicles a bit, maybe gives them some scrapes, dents and a dirty windows etc. make them look more closer to how the vehicles would look in a Zombie Apocalypse.