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antp
I agree with eLMeR - if a vehicle is reasonably visible and/or has a role, it deserves a page, whether or not it can be ID'd.
I agree, at least for the "and" version: there can be "forever unknowns".
Also, it is always possible that someone someday has info about the car (having worked on the movie, etc. it already happened several times) or that a picture upgrade gives more visual details
If not reasonably visible (like the back of a truck, as Exiv96 mentions), then moving to comments is fine indeed.