A camper is a self-powered vehicle.
A camper trailer is pulled by another vehicle.
Note: Camp trailer plates started in 1924.
Above: The tab is missing, but I would say this is a 54-56 base plate.
Above: 1967 example. (GL collection)
Above: six digits and no "dot" separator! Very odd.
Note: Camper plates started in 1969.
Above: Unusual "Vanity" plate. Seldom seen on this base. (JWW collection)
Above: Current issue Camper plate with 2003 expiration. (DS collection)