Who said anything about portable? :)
Yes, when camping often in deep shade, permanently mounted solar won't be much useful. The OP are snowbirds, and those are after sun. Snowbirds camps are out in the open. To get plenty of shade, they need to travel pretty far South, like Mexican tropics, and those places are more densely populated and (usually) have electricity. Farther South though, on-grid camps disappear, locals don't camp and most gringos don't go that far either.
Summer in Ontario (or BC) is a different thing. Still doable without a generator, for 4-5 days, if you carry enough batteries. Without A/C of course.
