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‘World’s first off-road solar SUV’ just drove across Morocco powered only by the sun
(edition.cnn.com)
This is a most excellent place for technology news and articles.
Even if you're off grid, it's still better to put the panels and most of the battery on a house.
You'll get much better yield because the panels can be pointed in exactly the right direction and won't be covered in road dust, plus there's far more space available.
Putting a smaller, lighter battery in the vehicle is going to reduce its energy consumption, as is using a shape designed for low drag rather than a shape set up for optimal solar.