Greetings!
When I had 4 people, I had a 7 foot long dinette, and the backs on each side folded up to make bunk beds on each side, the table could also be put down to make the bottom bed into a queen. It worked but it was a pain making the beds everyday.
In my bus, I had queen sized bunk beds permanently across the very back. That was much better because the beds stayed ready to crawl into. A 4 person dinette across from a sofa/bed in the front made a nice living/dining room. that would also make into two more double beds, then in the middle was the kitchen, bathroom, and storage/closets. It was very convenient and comfortable.
Cheers!
"Just because everybody's doing it, doesn't make it right." ~ THOW (Tiny Home On Wheels)