I can't imagine that bed arrangement will go over well with American buyers. As can be seen from snap shot of video in link above, you'd have to crawl over your partner to get to back of bed; making it much worse than a corner bed. And it's fairly high too.
If they use the extended van and installed twin/king beds, I think the floorplan would have more appeal to most couples over 30.
As to sleeping 4 people, I have seen some European seats that tumble and extend over the driver's seat when turned backwards. They are very expensive so maybe it's an option.
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