There were owner's manuals for each item of installed equipment (generator, stove, furnace, etc) included in the literature packets I got with each of my 3 RV's. 2 were used one-owners, 1 was bought new. These went all the way down to the LP and CO detectors. If you don't have these, you can often get them either on-line or mailed from the mfg'rs website by supplying the model #.
But yes, postings complaining about generic, uninformative overall owner's manuals are pretty common here. You've likely got what was standard for the model.
Jim, "Mo' coffee!"