Large Truck Campers: how practical?

If truck manufacturers were serious about the TC market, they would bring back the camper special design where the axle sits far back in the frame with less overhang. The shift of the axle rearward would address much of the CG issues people experience when they hang too much weight off the rear. My Mammoth is tail heavy unless I have water in the fresh or gray tanks that sit forward of the axle. With my trailer, I use a WDH to restore 100% of the front axle weight. Once you do this long enough, you find ways to compensate for a less than ideal design. I suppose you could start with a 84" CA chassis cab and lop off the rear overhang, but now you are looking where your primary fuel will be carried...