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I'd start with weighing the stripped chassis front and rear axles, and calculating where your load should be for weight distribution. Put the load as far forward as possible. this will allow taper in plan. 8' wide at the back of the load, rear axle width at the axle line and then you can increase as you go back from there. The radius for the transition from the cab should be greater than the depth of the transition, in other words, start at maybe 45% in plan.
Round back off the top of the windshield in plan or elevation, or both.
Make the bottom of the foldable tail separate and strong enough so you can use it for a back porch when your parked in the country.
If you use metal studs you can notch them to make curves. Turn them so they're 2" deep, not 4". that will gain 4" in interior space.
There have been discussions of rooftop blisters for vent/air conditioning, but I don't remember the thread. Maybe someone else will. I would recommend going through the Phil Knox seminars.
All above IMHO, of course.
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