If you are inclined to skip the hassle, expense and loss of otherwise usable space maybe your best choice would be to replace the camper you have with another size or brand.
Right up-front I will state that we do have a Parkliner
and it is for sale
. Also, I do believe it is one of the best floor plans and well thought-out interior designs to maximize space in an 7'x12' shell. That said, I will share info with you specifically about the bed. The dinette conversion for sleeping is 81" long by 5' wide. The cushions are thick, dense and upholstered with binded edges which minimizes them breaking down. Therefore they fit tightly together so there is no shifting or uneven surface. Throw down a comforter, lie down, throw one over yourselves and enjoy a great nights sleep.
However, we are selling the camper because we do have an issue with the bed. Well, actually the issue is with our decrepit bodies, not the bed. Somebody has to climb over the other body to get up. Creekie knees all round (one replaced) and a recent massive rotator cuff tear; selling seems better than investing in Depends . . ha-ha!!!
I would encourage anyone looking for a small camper to check out the Parkliner
for themselves. The specs are all there and the list of features and options leaves you wondering, "how did they do that"? And the aisle is still 31" wide! "How did they do that"? Sound like a sales pitch, you betcha.