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As for modelability, irrespective of how complex you make it, we can define it mathematically as a static form, but I think the issues lie more in practicality, both in interior functionality as well as exterior performance. The shapes that you seem to allude to are more along the lines of the old style streamline caravans with the rounded corners which performed brilliantly in managing as an appendage to the main vehicle, but not necessarily as the main vehicle with all the steering and braking controls fitted, the rounded shape does note bode well to parallel air streams but does increase stability in crosswinds where a phantom boat tail may well be disrupted.
Hence I think not much beats the robust handling Kammback that can handle a little disruption from crosswinds when 98% of it's life is spent toting a phantom tail, the gift that keeps on giving.
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