Probably all cars would want to be some other model. Better performance, slicker bodies, some would go all out and want to have doors that slide up instead of open sideways…and all those big rich cars? They would be upset of their curse, how they can’t ever be driven in Winter, and how all their owners sniff lines on their hoods, and only respect them until the next schmoe who flows comes along.
In all reality though, most every day cars would dream of higher stature and luxury, however, they would probably just be happy if their owners took decent care of them, and they’d probably be as grouchy as people are, when the cars need to be started 20 minutes in advance during the Winter, at four thirty in the morning.
Cars are a lot like people, as they need to feed, and be regularly maintained. If cars had human brains or whatever, they would most likely worry about worn out parts, rush hour and accidents.
The only one who is happy being what he is, would be the Packard Hearse. Thirty seven years later, you fish him out of the river, and his radio is still playing…