There isn't anything such as a "real" paper manual for most brands of rv's. Well, maybe for a million dollar plus rv has one.
They usually come supplied with a general information book from the rv manufacturer which they call an owners manual and a stack of manuals from the installed appliance manufacturers.
The best anyone can do when buying used rv's without documentation is to find the name plate/tag on the appliance and get the manufacturers name, model number, serial/part number then look it up online. Sometimes the name tags are in places not easily seen without a flashlight and mirror so using the camera on a smart phone is a great way to get them. Many appliance manuals can be found in the Library section of this forum.
Richard & Jill
2014 Flagstaff 832IKBS Classic Super Lite
2018 Silverado 1500 Crew Cab Z71 4WD All Star Edition
Camping since 1989, Seasonal since 2000.
Car Shredder Op/Tech, Scrap Metal Recycling - retired