One of the last point is that no one in a vehicle should expect privacy, and IMHO it's the only point worth talking about, because others have been explored ad nauseam.

Let's say he is right (there is a case for and against). In that case anybody should be able to access the data. To prevent abuse, let's have people requesting access fill a form with their last name, reasons for access+time constraints, and make the requests public, so that everyone know who searched for which car. Maybe add a secondary access, where you input a badge number and a warrant number, that prevent the data to reach the public for a set of time (at most a year).

Also if that happens, I will probably make an app so you know when someone searched for your car.

Sorry I'm hn brained today.