All of the people I listed would have physical access for hours, out of sight of the owner. (see edit)

Is easy to find a tracker that’s stuck to the bottom of a car if you put it on a lift and spend a few minutes with a flashlight (and since just takes a minute and a lot of mechanics are decent people, it’s not hard to find someone to do it for free). And they either have batteries that will run out, or have to be wired to the battery which limits where they can be hidden.

Edit: misread your post, didn’t see that you were talking about physical access to retrieve data, not bug the car. I’m pretty sure these cars have Bluetooth and wifi though, which the entertainment system most likely has access to.