Landrovers used to have an option called the Safari roof, a second layer above the actual roof with some ventilation so the bit in the sun had an insulative layer of air between it and the actual roof. Some German truck builders offer it too.
You could add such a second layer to help keep cool in the sun, and put flexy panels on that? They stay cooler so work better, interior stays cool, all good?
A solid solar panel would do the same thing but with gaps between. Even black mesh as a roof rack floor seems to reduce internal vehicle roof temps.
What's under the roof it's going on, bare metal or insulation?
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