In case you don’t know, there is a vast cult of RV’ers on YouTube with (what seemed to me to be highly experienced) vids on just about topic you might imagine. I found a lot about “what to look at on a used RV” that might be useful to you.
I’ve viewed quite a few over the past month, thanks. A lot on the GMC, and a lot on various “hacks” for boon docking off-grid. It’s been very interesting.