There some pics of my electrical system on this forum in the thread of Fitz’s build.
I have a 12v deep cycle marine battery (group 24), a WFCO 30 amp converter/charger which allows me to hook up in campgrounds. I also have a 50 watt solar panel tied into the system. It is semi permanently mounted to the top of my tongue box.
My system is far more than I need but it gives me plenty of options.
Did you make some type of template to assist with your layout of your electrical? I like to take your layout plus the layout items from the demo and “mix and match.”
It would be nice to get a sample layout that was used in the demo unit as a guide (that is if it is still available).