Not sure how hanging all the roof components off the back end would affect rear axle weights, more than likely they would ugly. Might work for a one AC unit. Still need roof vents for bathrooms, kitchens, so there would still be holes. But point taken, there has to be a better way to assure the roofs don’t leak.
I’d like the option (some allow it) NOT to have an oven or stovetop. More counter space, more storage. I’ve owned 5 motorhomes and have yet to use the oven for anything other than a bread box. Convection microwaves have been around forever.
It ought to be required that anyone designing these things be required to spend a month in one of these and they would have a better idea of where to put things. Does it really make sense to put controls at floor level beside the passenger seat? They need to spend another month working as an apprentice in the service dept fixing things and find out hey you can’t replace the grey valve when it’s midway under the floor.