The Olds and Plymouth wagons were shot by Kitt.
Here's what EJacobs has to say about this Chevy Biscayne wagon: This sucker still does trailering duty for lawn mowing equipment. Much respect for being such a raw, old working 'mobile. Probably would survive most apocalypses. And it's a wagon. The interior is disintegrating. And the rear seats are...folded down, I guess. Somehow, I think that's a permanent feature.