The good news is that RVs, like boats, are largely assembled from 3rd party components. About the only thing made by the RV maker is the frame, cabinets, and upholstery. All of the appliances, fittings, water pump, converter/inverter/power distribution system and so on are assembled from 3rd party components.
So chances are when you need to fix something, parts and manuals will be readily available - which I suppose is one reason RV manuals are horrible... not much unique information to put in there in the first place.
Other than perhaps a good wiring diagram...
You can download a Four Winds manual which while not exactly for your unit, will probably have applicable general information that might be useful to you... such as how to dump the black and grey water tanks (and the need to keep the black water tank shut off between dumps), that you need to be somewhat level for the slideout and fridge to work, and so on.