There is a weight limit that can easily be exceeded with 5 passengers of average American size, let alone 7!
Just looked. Kind of an ugly car actually, but if you're wondering whether I'd kick it out of bed, absolutely not I think there may be confusion between Prius v and the Prius V, which is the Prius Lift back version V. Or something, I think. Who knows, I didn't come up with the idiotic nomenclature and any confusion on the part of anybody is understandable in light of these naming schemes Toyota has graced us with.