I recently installed a jackknife sofa that I purchased from RecPro in our Axis 24.2 which does not have a dedicated bed. I also purchased RecPro’s optional legs.
I installed the jackknife on a slide. This adds a few inches to the height of the couch and I had a machine shop cut the optional legs down and reweld the attach points. In calculating how much to shorten the legs, I had to make sure that it was enough clearance for the front panel to to keep it from rubbing on the floor. To be clear, I installed the front panel immediately in front of, rather than on top of, the slide.
Also, the design of the jackknife is such that you are limited as to where you can attach it. In my case, the attachment is at each end of the sofa which put one side directly over one of the aluminum panels on the bottom of the slide. This required some creative “engineering” to make a bracket that reaches past the aluminum panel.
The couch sits closer to the aisle which opened up some additional storage between it and the side wall. There is also room for storage under the couch which is nice to have but not particularly easy to get to.
Our jackknife replaces a sofa that folded out and, using an air mattress, created a full size (more or less) bed. I hated dealing with it and would just sleep on the sofa while my wife slept on the bunk that descends from above the front seats. The jackknife opens to a twin bed size (more or less) and can actually stay configured as a bed when the slide is in and we are moving to a new location.
A couple of hints. For comfort, I purchased a foam piece, designed for filling the gap between twin beds when they are used to make a king size bed. I put it in the gap between the sofa seat and sofa back when in the bed mode. I also purchased a nice fitted twin size pad to even things out further.
All in all, I am pleased with the installation.