Since I'm a single RVer, my first unit was a class 'B' Roadtrek. Everything was convertible. Bed/Dinette. Toilet/Clothes Closet. Kitchen area/Shower. At least I knew what I didn't want in my current 'C'. When I researched, most people in the know suggested a walk around bed in the rear because its easier to make it if you're not in it at the time. Also a shower separate from the rest of the bathroom facilities. And a kitchen/dinette in the middle because its between the front and rear tires and doesn't bounce around as much as the rear overhang when going down the road. And I removed the so called mattress in the cabover area, and lined it with non-slip rubber runners and low profile plastic containers for storage.