As a lifelong boater who cruised full time for a couple of years (analogous to full time RVing) I installed solar panels on a couple of my and friend's boats. So a few years ago I wrote a series of articles on installing a small system, sizing a big system and installing a big system.
These are available on a sister publication
https://www.trawlerforum.com/forums/. Look at the upper right of the opening page and click on Library and then go to the Systems section. Scroll down and you will find these three articles and a few written by others.
You have to do a bit of translating of terms to the RV world, but they are easy and correlate almost identically. For example when I say DC panel in the boating world, it means DC converter fuse panel in the RV world. When I say hang out at anchor in the boating world, it means dry camping in the RV world.
These articles cover installations as small as 100 watts up to a thousand or more.
There have been a couple of changes due to the market in the last few years that make things easier and cheaper. Amazon now offers large 200 watt panels in both 12V and 24V nominal specs with free Prime shipping. Previously only 100 watt panels were offered and could be shipped reasonably.
The other change is the availability of reasonable cost MPPT controllers that make it unnecessary to use PWM ones. Renogy makes decent ones and Victron makes nice ones. Prices have dropped almost in half since writing these articles.
Avoid the no name brands. I have almost always regretted buying no name Chinese junk. The same generally can't be said about solar panels. Unless you are squeezing the maximum wattage in available space and need the high efficiency of the Perc panels, almost any 100-200 watt panel is as good as anyone else's.
Enjoy!!!
David