There is no single "owners manual" for an RV like you think of like you get with a car or truck..
What you get when you buy a NEW RV is a packet full of about a dozen or more individual manuals for each appliance that's installed on your RV.
If you are looking for how you "use" your RV, then those don't really exist. That's where this site can "help", but in the end, you really need hands on experience from someone, or just trial and error on your part.
If you buy new, you "usually" get an hour or so intro to your new RV, from the dealer, but if buying used... You get what the seller tells or shows you.
Or search U Tube and there are tons of RV type vids for just about anything RV related.
Good luck! Mitch
2013 F150 XLT 4x4 SuperCab Max Tow Egoboost 3.73 gears #7700 GVWR #1920 payload. 2019 Rockwood Mini Lite 2511S.