Not sure where you could buy the jack knife couch that we have. The model 211 with slide has a couch that does not stick into the aisle as much as the models without a slide. When our couch is up there is 20" of space in the aisle and when down there is still 12" of space. Just enough to walk between when both are in sleeping position. We also have a dinette across from the sofa. Our dinette is almost exactly 40"W x 74"L. One of us can sleep on that and the other sleeps across on the sofa. To make the dinette more comfortable, we bought a regular single foam mattress from the local furniture store - paid about $59. We lay that on top of the dinette cushions and that makes a very comfortable sleeping position. We can use tv trays for eating, which we rarely do inside the RV. The couch gets a single 2" foam mattress topper that gets folded in half lengthwise and rolled up and put into a sleeping bag. To make it easier to stuff in the bag, we took a queen flat sheet and made a pillow case for the pad. Hope this is clear to the reader. I merely mention this to stimulate additional thinking.