I suspect that a 100 to 200 watt solar panel might not be much help if positioned in the pickup bed while moving. They are only going to put out their full power in optimal conditions, and work very poorly if they are partially shadowed. Like at 10% of their rated power, no kidding. I stuck 400 watts of panel on top of my camper with the assumption of reliably getting 100 watts. In a shaded campsite, I get less than that.
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