The concept is pointless. Trade the EV for a friend or family's gasser for the road trip. I wouldn't want to be in a small Fit, Fiat 500, i-MiEV, Golf, Smart, or any of the small EV cars for such a trip anyhow. Heck, the Prius barely fits everything for a week of camping and rock climbing for 2 people.
A genset makes sense if it serves double-duty as a backup home generator, but that is the only way to justify it.
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