Finding a manual for a '91 Ford van (cutaway chassis) shouldn't be too hard, use Google to search. You didn't mention make and model of the RV manufacturer, so I can't help there. Owner's manuals are often short on details, too many production changes and too few units to put a lot of energy into manuals.
I'd spend time going through every compartment, cabinet, and closet and note make and model of every component you find in the RV. Then use Google to find manuals on each component. Those will be helpful as to parts, troubleshooting, and maintenance. Also not any fuses or circuit breakers found, on a dark and stormy night when the lights go out you'll be happy to have those facts.
Happy camping!
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