Welcome to The RV Forum! That's a nice looking trailer! A Google search on "Aristocrat trailer history" will turn up several articles and resources, including a Facebook group. Most of the articles are based on research done by the
Tin Can Tourists group that collects and documents old RVs.
They were made in Morgan Hill, CA and in his autobiography Trailer Life Magazine publisher Art Rouse said he was resentful that Aristocrat became very successful without ever buying a lick of advertising in his magazine.
My family purchased an Aristocrat Land Liner trailer back in the late '60s. A couple of years later one of our trips took us from San Francisco to Disneyland, passing through Morgan Hill along the way. An individual in a Ford station wagon flagged us down and introduced himself as Irv Perch, Aristocrat's owner and president. He said he wasn't happy with the way the sidewall looked on our trailer (there was a small cosmetic defect where two of the slats overlapped) and asked if we'd follow him to the factory and let them fix it. My dad declined, saying we were going to Disneyland and didn't want to interrupt our vacation. Mr. Perch insisted and suggested we have lunch in his restaurant on him and the trailer would be ready when we got back.
We agreed, and followed him to the factory. He had us drop the trailer not at the customer service building but outside the assembly line. He went inside and returned with two workers, pointed to our trailer and in no uncertain terms told them to "make it right".
We had a nice lunch and when we returned the trailer was fixed and looking like new.