1956 flying cloud, vinless?

[Motoxflyer1]

I'm trying to locate the vin on a 1956 flying cloud, from the small amount of information available I've come to the conclusion that trailers manufactured prior to the mid 60s did not have vin numbers? The tag located next to the door has the number 8146, the problem is the title was lost and the plates have not been tagged since 1988 and the trailer was not found in the ca dmv system based off of the license plate.... I did not bring the numbers 8146 with me so I'm not sure if this serial number could be used to trace the trailer at dmv?

[55AS]

You are correct that trailers that old did not have true "VIN"s. The number on the plate is a serial number and should suffice for registration purposes since it is all you have.