The jackknife sofa is neither comfortable as a bed or a sofa. It's an abomination. We have a cover for it and the dogs sleep there. During the day, it's the only other place to sit inside save the dinette, so we watch tv from it. I would replace it, but water tank and pump are located underneath. I don't think even a good foam pad would help. You will still have the center to deal with the hump.
Making a smooth transition to senility for over 70 years
2017 Freedom Elite 29fe
2015 Jeep Wrangler Toad