Unfortunately, advanced aerodynamics wouldn't improve the space-savings in a motorhome so much as a boxy layout does. There is always some compromise. Anyway, I would eventually consider a platform with the engine closer to the driven axle such as the FWD Ram ProMaster in order to get a lower floor, since it would lead to an improved internal height even if the external height get lower than a comparable front-engined RWD van.
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