[aerohead]

I took actual data reported for CAR and DRIVER's 2014 Nissan LEAF ( DRAG QUEENS) and 'built' an 'AirShip' RV trailer sized to fit it [ 3,678-pounds ( 1671.8-kg ) and frontal area of 34.53-square-feet ( 3.208 meters-squared )].
1) The LEAF, solo, was capable of 117.2-miles range to 'bricked' status, at 55-mph, sea level, straight, level, dry, calm, concrete, standard air conditions.
2) The LEAF, as a tow vehicle, pulling a downsized 'conventional' RV trailer/caravan under the same conditions would be 'bricked' at 39-miles range.
3) The LEAF, as a tow vehicle, pulling a downsized 'AirShip' RV trailer/caravan, without propulsion would be bricked at 78-miles.
4) The LEAF, as a tow vehicle, pulling the downsized 'Air Ship', this time with the full propulsion system, bricked at 117.2-miles.
5) Approximately- 50 kWh would adequate for the pack.
6) At 'AirShip's' $20/pound retail MSRP, the smaller trailer would come in at $ 73,561 price ( with solar roof ), as a 'generational' RV, to be passed down through the family, or recycled on the market, as Airstreams are commonly done.
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'AirShip's' wake is part of it's 'secret sauce.' The LEAF experiences at trailer which is only the 'size' of AeroCIVIC.
Airship's actual trailer, as experienced by a Ford F-150 Lightning,or RVIAN pickup, is only a little larger than Spirit of Ecomodder.
This aft-body 'slendering' is greatly responsible for HONDA's Cd 0.10 DREAM, the TOYOTA-56' Cd 0.14, NISSAN's Sun Favor, Cd 0.11, and KIA MOTORS' Console to the Future's Cd 0.15.
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'Basic bodies with drag figures of less than 0.15 can be...used as initial shapes for shape optimization.' Wolf-Heinrich Hucho, page 198-9, 2nd-Edition, Aerodynamics of Road Vehicles, December, 1986.