There is not very likely to be an owner's manual at all. But you could start over at Tin Can Tourists. That would be your best bet. Trailers of that period and years both ways usually came with rough (really rough) schematics of water, gas and electrical but nothing that you should not be able to create yourself, and a sheaf of owners manuals for the installed stuff.
A lot of the manuals for the installed stuff can be found on line, but have to know the model number.
Frank
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