The roof and the sloped “bed” area looks like it would have been ideal for solar panels. Since this is an electric vehicle made by Tesla, it seems stupid they didn’t add solar panels to help with the range.
There’s nowhere near enough surface area to provide meaningful solar collection. Optimistically it could collect 200-300 watts, taking an hour of clear direct sun for enough energy to go about half a mile. Too much cost/complexity/fragility to get way too little benefit.