I've though about this. 100 x 100 W solar panels charging for 10 hours per day would give you 100 kWh, which is about 500 km range in a Tesla X or S. 100 panels

I've though about this. 100 x 100 W solar panels charging for 10 hours per day would give you 100 kWh, which is about 500 km range in a Tesla X or S. 100 panels is a lot — you'd need a small trailer to carry them, and set up and packing away each day would be hard work. But it would be possible. US Route 66 (4000 km) would take 8 days. Circumnavigating Australia on Highway 1 (14,500 km) would take ~30 days. Drive at dawn and dusk, park during the day and see the sights.