Two coaches ago I had a jack knife sofa. I limited my search for a MH then based on how big the sofa was so it could be used as a bed all the time. I ended up with the Adventurer and the 72 inch as it also had the arm rests that came off which I stored inbetween the front ( side of sofa ) and the drivers seat so it would be a solid platform for the pillow. This worked well. I adapted to the line in the middle by sleeping diagonally. Not the most comfortable setup but doable. No worse than some places I have had to set up tents over the years
The new MH has the pull out / fold out and needs the slide out open before use which aggravates me as if there was every high winds I would not be able to use it. You would think they could invent a better sleeper.
Here is the thread for what I have been doing on the foldout:
Anyone replace pull out air mattress bed with foam?
When I go traveling with an extra person I have a coleman air mattress off their cot/air mattress item. I ditched the cot and kept the air mattress. Got it in myrtle beach at the factory outlet. I did that as it was narrower than the twin size and allowed the person on the fold out to get back to the bathroom at night easily. A foam topper on the air mattress on the floor is comfy. The coleman 12v pump is fast inflate and deflate. I installed a 12v outlet on the floor level next to the entry steps for easy access for the pumps plug.
Only problem with the air mattress is the condensation and the underside of the foam topper is wet in the morning where it contacts the mattress. Not sure how to correct this as it just started with the new camper, the last camper we never had that problem ... and it was the same setup. Same person, same mattress, same foam pad. I have tried a rug under the air mattress thinking it was the colder floor lowering the temp in the mattress overnight and causing condensation but still does the same. Next time I use it, I will see if a mattress protector under the foam will help, at least even to keep the water from the foam pad. But then it might not work at all...