I have a rear bunkhouse now and honestly I like the floorplan,however if I were buying today I imagine I would have a mid bunk model which would allow for a rear lounge area.
My current rig is 39'.In order to have the interior space to give us all some room I think I would still be in the 40'range.
Front living rooms are really not the solution because the kids will commandeer the living room as their space leaving the adults with no lounge area. A mid bunk or even a rear bunkhouse gives the kids a dedicated space to call their own. Which in turns leaves the living room for the adults to call their own when necessary. My kids are older and my bunkhouse days are winding down. A rear lounge floorplan is in my future once the kids are gone.
But if there are kids in the picture I prefer a bunkhouse rear or mid.