For nearly all of our fifty-six years of marriage, we have had a king size bed, so there's just no way the both of us are going to be comfortable in the rear (48" wide) bed in our 23D. Our rear 'bedroom' area is 'The Queen's Chambers,' and I'm left with the front sofa area. Worked perfectly in the month we spent in Colorado back in August, but I hated fiddling with the cushions and every night having the backrests draped across the table. Yuk.
Then, I had a blinding flash of the obvious.
I could just pull out the extension under the sofa, and by adding some 1/2" spacers to bring the height of the 'extension' up to that of the stationary platform, I could simply scoot the lower cushions over and leave the backrests in place. This gave me a 34" wide bed... the same size as the 'standard' Airstream twin width.
I made the spacers from 12mm Baltic birch plywood and put little 3/8" diameter vinyl 'pads' on the back side. This keeps the spacers from scooting around in use or in storage.
Now, I can 'do' my bed for the night in seconds, and the backrests stay in place, so that stacked-up-unsightly-mess is no more. By the way, I just use my trusty down-filled sleeping bag.
I store the 1/2" spacers under the fronts of the sofa cushions.
Simple, and practical.
2014 23D International Serenity - "Fortune Cookie"
2015 Ford F150 3.5 EcoBoost, Max Tow - "Cookie Monster"
And some stuff
On my 25fb I just put the backrest on the floor against the platform base. The bed width is perfect compared to the Casita I had before where it was only 24" long. I don't pull out the tray. Before I did this I would pull out the tray and put the back rest under the tray but I find the other solution better for me plus it leaves more room in the living area. I only have to sleep back there when our daughter comes with us on a trip.