Check this out at Treehugger
 

[URL="https://www.treehugger.com/files/2007/08/autorucksack_a.php"]

https://i.treehugger.com/images/2007/...windtunnel.jpg

Just take this a step further? How about an inflatable temporary boat tail? :eek:

Acutally just thinking, a "neat new idea" that seemed to pop up in 60s, 70s 80s, Science and Mechanics, Popular Science, Popular Mechanics, Mechanix illustrated et al every 3 years was swappable bodies... The idea being you could have a sporty body, a family sedan body, truck body etc to swap onto the base vehicle frame.

Now oldskool full frames are pretty much out... However, think of a carbon fibre "X" backbone frame with built in battery tunnel, the basis of a lightweight hybrid... and you could have the 2 seat lightweight commuter body, Cd of .15 barely any luggage space, and a family wagon body for weekends.

Amusing thought.... "Inflateable Minivan" you have a low Cd coupe body that converts to a minivan.... bet you could "proof of concept" it on a "dustbuster" van.