Ran across what I think is a good system to add Solar power to your rig. The solar kit is made by Go-POWER. I have purchased one of their inverters and like it very much.
I did not shop around for price. You may find a better price on a different system. I'm only showing this as it does a good job of explaining the components of a Solar kit for your RV. The video is from YouTube and is very well done.
Disclaimer: I am not associated with Go-Power nor do I profit in any way from this post.
Here is the YouTube Video:
You Tube Video
Here is the Solar kit sold on Amazon.com: