I understand that there are 200W panels now that are nearly the same size as our factory 100W ones, Bob, and some can be adjusted to face more toward the sun as needed, manually, electrically, perhaps even automatically. I’d think the number of panels needed then depends on that, but 400 watts would be a minimum total for the way we carefully use power dry camped, assuming full solar exposure. 800W (four 200W panels) would be great.
So obviously habit of use, individual panel wattage, and solar availability all play into how many you’ll want, not to mention cost including that of an appropriate controller.
Others here have recent updates to their solar and may provide more experienced opinions.
Joel