One thing to remember is that a home style hide-a-bed has a mechanism that folds the mattress into the area beneath the cushions and takes up all that space clear to the floor.
This would mean that you wild lose the drawers beneath the gaucho. Also, in my 1983, the batteries and the Univolt are in that same area at the very front of the trailer. See:
Not saying that it won't work, just that you need to take clearing the batteries into consideration when you evaluate where the new sofa will be placed.
I'll be interested to see what you come up with.