Howdy booyah and Welcome to the Forum!
I think you still need to clarify further what you are looking for. Motorhomes are not like cars and trucks when it comes manuals.
If you need info on the chassis (engine, trans, brakes, etc) then you'll want a manual specific to the chassis (Ford F53, Chevy P30). If you want info on the coach and installed appliances (fridge, furnace, water heater) then you'll want the individual manuals for each item. Most of this stuff is available online as a PDF download. This web site will give you a good start:
Service Documents
I don't know about Winnebago's coach documentation but the manual for my Coachmen is very generic and covers information for all their motorhomes so it is fairy general and of limited value.
I will say this - if you have a specific item that needs service, someone on this Forum has "been there, done that" and we are usually more than willing to help out.
Best of luck!