I still do not understand the whole "solar panel on roof" thing. To each their own I guess.
Can't beat free resources no matter how you look at it....well unless it shorts out and burns down your rig or home.
If I'm going out by myself camping or with my core group we typically have zero electrical devises besides a blue tooth radio that can charge stuff. Any/all electrical lanterns are pretty much banned. Smacks handed out for looking at someone with a headlamp turned on/etc. Pretty much enjoy our nigtht vision as much as possible. That said, my car was not happy after siting in 5deg for a few nights and the initial start up was rough. Being in the middle of nowhere camping solo got me to thinking about solar. Not for anything permanent. More for a back up system for emergency preparedness/long term camping/jump start.
Only thing I know for sure is I will not be messing with any sort of lead acid batteries or goal zero type stuff. Lithium Ion only with the smartest solar controller and best fold-able/portable panels I can find. Looking for Qualcomm 3.0 but tech hasn't reached the masses yet it seems. Think only one panel is "in design" with 2.0 and one panel is on the market with 3.0.