I updated the original post to add the photos. Sorry for teasing you guys! As for the photos, you can see all four wheels had some kind of sensor on it and there was wiring kind of running everywhere. I initially thought the thin box up top was a solar setup or something as I was pulling in, but it was just a sheet metal box. On the dash, you can see there's a display mounted to the windshield, presumably displaying the data from the wheel sensors, as well as an industrial looking stop button. In the back seat, there was also something that kind of looked like a big fuel tank seat-belted onto the rear seat, but I can't imagine that would have been what it was. One of the guys who got in the car said they were from the factory (the car had manufacturer plates) and when I asked him what the car was for, he said something about wheel dynamics or something like that, choosing his words very carefully. I made sure to tell him I understand if he can't talk about it, and at the end of the brief conversation, he said something to the effect of "Sorry, I'm just not sure where the line is", in regards to divulging information. I didn't really press him for information as I could tell he was slightly uncomfortable and I certainly wouldn't want anybody to get into trouble. Any thoughts?
PS, I'm not sure what the blue coloring is that showed up in the glass on the pictures. It wasn't actually there in person, obviously. It must have been something weird with the camera on my phone.