They are characters, but they do not have a major role. A 5-star car means that the car is important enough to be listed as a character, like Christine. Or that the car is very important in the movie plot, like in Back to the future.
But here lots of cars have a small role. Like the trucks in Maximum Overdrive: they are "alive" but do not all get 5 stars, as some only have minor roles or seen only in few scenes
So only the main character car should be 5 stars I think.
About listing the vehicles, I guess that we could list them as we list the cartoon vehicles too. I'll upload these later.