Imagine a hybrid car that's not part gasoline, part EV. Imagine hybrid BEV / HEV. Since the battery is easier to charge (and can be charged at home) than refilling the hydrogen tank, the battery should be the main power source for many miles, not just 30 or 50 miles like a PHEV. It'd be nice if the battery could go 200 or more miles. But if you're driving through a charging desert and the battery charge gets low, it can turn on the hydrogen fuel cell to get more power to go another couple of hundred miles.
Great! Freeways packed with miniature hindenburgs. LOL!
Plug Power has been imagining fuel cell vehicles since 1997, but they have yet to produce a commercially viable model except for niche purposes. High price golf cart, yeah. Cross country vehicle, not on the horizon. Engineering and cost are formidable obstacles.