If you're going to do solar on an RV, you really should read Handy Bob Solar too [0]. The site formatting sucks, it's very much wall-o-text, and he's absolutely right in everything he says and rants about regarding RV solar.

Far too many solar installers just treat a system as the entry to people coming back for more, when the problem is that they don't know enough to adjust it properly for the stuff that was installed in the first place.

[0]: https://handybobsolar.wordpress.com/

//EDIT: So, apparently, a site that's been static since 2011 and I've linked quite a lot over the years was updated again in 2020 with some ranting about Covid. You can safely ignore that, and read his older writings on solar installs, because just about everything he says about that is correct, at a "Spend five years hands on with solar and you'll eventually come to agree with him, no matter how loony he sounds about some of it when you start in."