The discussion was about Kauai in particular, and then was generalized to all of the Hawaiian islands, so my comments apply to that.
Near Seattle Washington they have the San Juan islands a few miles offshore, and it would make sense that people might want more range when visiting the "mainland". Ferry pricing is reasonable and travel is common.
Regarding PV; it's better placed on a roof or other stationary object ideally situated. The only reason you'd reasonably put it on an EV is if you're offgrid and have need of charging but no grid connected way to do so.
Recently I looked at a smartwatch that came in PV or non-PV varieties. The PV version was like $100 more, and added between 4-14% extra runtime in ideal conditions. Dumb idea unless that last little bit is absolutely essential.
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