Good info posted above. IMO one of the most valuable and best things to us is to make up your own "owners manual". Not the OEM's but your own that you have either online or in a notebook binder that has every thing in your RV with a separate tab. Within the tab or section...you have downloaded and or printed out everything you could find out about a certain item. Example... on mine about 6th tab in is our slide out. I have oem "owners manual and the trouble shooting guide, size and location of the fuse, size of the pins and type and size of motor, along with any maintenance items required. (As you come across any maintenance items add them to your maintenance check list).
So when does all this come in handy in real life. (because it was a pain time wise to make up our binder) For us one time... we got ready to hook up and leave and I hit the "up" button to lift the trailer jack leg and it didn't move. Got out our "book" and turned to the trailer jack tab. On the oems "trouble shooting" guide it said to the check fuse (that was right after checking I had 12 volts to motor, which also means also carry a volt meter) as it turned out the switch was bad. So I just used hand crank to raise the leg. (By the way I knew exacting where jack handle was stored by my notes) Called a couple rv places that we knew we would be going by in our travels. By looking at the info I gathered on jack, was able to give brand and part I needed. Actually took a pic and texted the RV place. They texted back and said they had in switch in stock. Didn't have to mess around with rv place trouble shooting the jack or trying to sell me a new one.
While making up your binder is not new and I did put if off many times, what convinced me was some people that their water pump didn't work and they had no idea what to do or even where pump was located. You don't have to be a "master" mechanic" by any means but being at the mercy of others is not a good feeling either.