One thing to consider,, RV's consist of many systems assembled together.
Walls, Floor Ceiling Roof (How much manual do you need for these) frame and wheels/axles and optionall engine and drive train (Standard truck/trailer, again how much manual do you need)
Radios, Televisions, Fridge, Water pump, Slides (optional) Awning, Mirrors Doors, Microwave, Sink, Shower, Toilet.
All these are made by other companies,, You can download the manuals for them from the company web site.
Page 2: The aforementioned walls and such
The RV Book
The RV Owner's Handbook
Both are generic owner's manuals, The one I bought covered general care of several different types of walls and floors and such, also covered routine maintenance of many o the appliances, IN SOME CASES better than the factory manual. Either one is good, you do not need both.
Home is where I park it!