I bought
this maintenance manual. I don't know if we've really ever used it - maybe I've looked up one thing? But we keep it with the owners manual, and if I didn't have an owners manual it would probably become even more handy.
A couple other things I did...although since you already have your RV you may not have the time/inclination to spend as much time researching (read: dreaming) and prepping as I did while I saved up and searched for the right model...
1. I read here. A LOT. I felt like after reading everyone else's problems/questions and the associated responses, I had a really good understanding of what to look for and how to best operate our RV when we bought one. DH's parents had an RV when he was younger, so he knew a lot about them without needing the research step. We're both very handy, so understanding and optimizing has been a fun process.
2. I searched on ebay and google for my model periodically (mostly as part of the search to purchase one). Granted we ended up buying a slightly newer RV than you did, so you may not get as lucky, but I was able to purchase complete systems and electrical diagrams for our model that appear to have been taken out of a dealer service center that shut down. You never know what info you might find if you search on your model every once in a while.
