The hybrid system: A mix of the two sofa mechanisms, this will involve pulling, folding, or sliding a frame out to transform the sofa into a mattress. Such as, the bottom of the Post Nordby Pep Sofa Mattress slides out plus more cushions raise to create the sofa bed floor. https://juliuskagwf.blogminds.com/new-step-by-step-map-for-ramp-truck-beds-28612495