Somebody has added a couple of cars (including the AMC) now: http://www.imcdb.org/movie_5257744-American-Gothic.html

American Gothic was a 13-episode TV series that aired on CBS during the summer of 2016, recently concluded.

It is worthy of inclusion on IMCDb because one of the main characters (Cam Hawthorne) drives a 1967 AMC Marlin (production 2545 units, currently only 1 on the site).

Other vehicles used by main characters:
*** Ford Focus sedan
*** Ford F-Series
*** Mercedes-Benz E-Klasse
** Tesla Model S

A dark blue Cadillac plays a minor role (**) and is identified in the dialogue as a "1985 Cadillac Fleetwood"

http://www.imdb.com/title/tt5257744/