Would a car ever have two license plate numbers assigned to it beside dealer plates?

Answer 1

Yes if it is registered in two countries.

Answer 2

Yes. There's also repair plates (used by mechanics, similar to dealer plates), temporary permits (which are equivalent to a license plate), and commercial plates (which are intended to be combined with another plate). There are also auto enthusiasts that may install a foreign plate on their car to simulate a "euro" look, but this usually isn't legal. On a similar note, some types of vehicles like cubevans, ambulances, and schoolbuses may have two VIN numbers, one on the vehicle chassis, and another on the aftermarket bodywork.