Winterizing isn't that difficult, once you figure it out. Start with your owner's manual. If you didn't get one, do a web search for your coach.
You will likely find a video on YouTube that will show you how to winterize in general, but it won't show you where the valves are on your specific rig. The plumbing varies with different models.
Some of us had to learn the hard way about forgetting to drain the water heater!
Lessons like that don't have to be repeated to be learned!