Owner's Manuals usually aren't worth the pulp used to print them. They are very generic and don't really tell you what you're looking for. Lawyers probably review them and so they are full of, "Use your seat belts," "take to a dealer for service." Many times production line changes aren't reflected in the manuals. They don't give details useful to ownership or servicing.
You can find lots of Class A manuals available on line, Winnebago has great documentation and this website has other manuals available:
Manuals - 1990 & Newer - RVing-The Midwest Connection
One of the best things you can do is go top to bottom of your RV and note the name and model of every system you find. Then sit down at the computer and Google each item and download the PDF manual for that component. Often you'll get operating instructions and troubleshooting tips along with part #s.
Here's one place with many component manuals:
Service Documents and Manuals