Friend of mine asked me if I knew "WTF was this?"
This is a car mounted with 4 license plate readers. This is probably the Repo Man, looking for cars to have a tow truck later come by and collect.
The plates, and the easily searchable information related to them for a penny or so a plate, become part of a database that can be sold for other reasons. Including to the cops, bounty hunters, credit reporting agencies, insurance companies, banks, you name it. https://www.eff.org/sls/tech/automated-license-plate-readers/faq#faq-Are-private-companies-using-ALPRs
Not being a resident or a guest, this is also trespassing. Shame no one presses charges over this sort of thing. It's EXTREMELY intrusive.
Driving onto private property for this sort of activity should be illegal.