I'm a big believer in maint. Read this forum and see what falls apart and make your own check list to prevent problems.
Start by downloading every manual you can find for your components you have in your RV. Heaters, a/c, awning, axles, and anything else you can find.
Overall start by prioritizing what needs to be done or looked at and make your own checklist. If you don't know how to do something ask here, you might get an answer.
(Prioritizing in order of saving you money)
Unit must remain water tight. (roof, windows, vents, etc)
Platform the RV rides on (axles and bearings, tires and wheels and brakes)
Remember the goal is protecting your RV and not having to get your RV fixed with rates over $100.00 an hour by someone that could care less about your stuff. And many stories on here about people waiting for parts for a long, long time.
Which makes me do a lot of maint myself. After many years my maint list covers the basic's listed above and many extras like putting a couple of drops in door key ways every year. OK, so it drives my wife nuts sometimes.
I've only meet one other person that does as much as I do. We actually met a guy and found out he removes his elec sockets every other year and to make sure the screws are tight that hold the wire in place. He feels the bouncing down the road loosens them. He had a RV fire many years ago and he feels better after they are checked for tightness.
I bet I have maybe $500 in maint tools that I've bought over the years. Jack, torque wrench, hand tools, etc. The last being a $150.00 ladder to bring along in case elec awning gets stuck in deployed position or some trees need trimmed to fit into a spot.
Anyways that's my take.
2003 Majestic 23P... Northwest travel machine
2013 Arctic Fox 25W... Wife "doll house" for longer snowbird trips
2001 "The Mighty Dodge"... tow vehicle for "doll house"