A very clever if space consuming system in the original van, I suppose the cushions would have to live on the rear bed when travelling.
Yup - there would be that "setup time" on arrival, but as the bed is not in use when travelling, not too much of a pain I would think.
I would think if you were a 4-person family, you would want 4 permanent travel seats and likely form part of a dinette setup? but for a "2+2" type occasional use, I can see real merit in this solution. Or if you used the van as a car replacement usually, but then went away as a couple when camping say.
I suppose it could be a bit like those old American Coupes which were 2 seaters but had a Rumble Seat at the back