Thanks to Suz, DaveK and CindyL for all of your input.
Yes, I have one image of this trailer and will attempt to upload it with this reply.
It is my understanding that it is made from "molded fiberglass" and, judging by the appearance of the material, it does resemble the fiberglass of my 1954 Corvette!
Also, I am familiar with "...with U.S. Rubber (now Uniroyal) out of a rubber compound called Royalex". There are a couple of different materials that are called "Royalite". I believe that was the name of a flexible rubberized cloth material that is/was mainly used in some U.S. Navy "riverboats" for Special Operations purposes, folding kayaks (I have rowed many times in both the single and two person "foldables") and in some aircraft applications. As I recall, it is not as durable as fiberglass, nor as light
(on a strickly comparative materials basis) as fiberglass, carbon fiber nor aluminum. Each has its advantages but I am surpursed to learn that someone would have made a small camper from this material.
The other "Royalite" is/was a lightweight, usually very thin type of ABS (a "plastic" material"). In this case its use in aircraft (for non-structural purposes) has been superseded by much more durable variations of this product in the last thirty years.
Anyway, I appreciate the input and if you are able to view the image below that I inserted perhaps someone will have some additional information?
Van Nuys Airport
Van Nuys, California USA