It's not like a car or truck, the manuals are not created for each model.
Look at your rig as a van and separately look at the appliances and fixtures within it.
The Van chassis is likely a year prior to the claimed model of the rig overall, and the fixtures are likely for the claimed year of the overall rig.
When researching repair info, you will need to have the make, model of the individual component, such as dometic refrigerator model # and year, or converter brand model and year.
You may find an odd manual for a similar model and get some limited value from it, but overall you will find that the piecemeal approach will be required.
You will also find you tube to become your new favorite website as you look for information and "how to's".
