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Doesn't matter how big of a solar panel they can figure out to mount to any vehicle; it will never be practical unless they can get much better than 20% efficiency, can lower cost further, or in very special use cases.
What are people supposed to do, not charge their truck for hope that the solar array will charge it? Maybe they get burned because they forget to plug in and solar doesn't deliver what was needed for their trip, so they always plug in... then the solar isn't being utilized because the truck is always fully charged from the wall.
Solar belongs in stationary locations where there is strong sunlight.
If I were gifted a rooftop solar array, I'd work something out with someone in phoenix to install it, since I would benefit from much higher utilization of the solar panels, and they would benefit from some of their electricity being subsidized by me. There's zero point installing solar in the PNW except for those off-grid locations.
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