There seems to be a lot of these Aristocrat trailers still being used.
There is a
Vintage Aristocrat Facebook page. They evidently have
Regional Rallys in some areas. Contacting an owner that is connected with these groups will probably net the best information.
It's possible that the year changed on the title but the owner's manual won't get you very informed for what you need in regard to restoring the trailer. I received the original owner's manual for my '71 from Starcraft, along with the sales brochure. Aside from the actual weights from the factory and tire sizes, there isn't a lot of info in there. If you're looking for schematic diagrams or a parts list, forget about it.