I really hate to pour cold water on this otherwise enthusiastic post... but it has been done already.
FIAT in the late 1950's commissioned Pinnifarina I think to do a study on this arrangement.
Bottom line:
No aero improvements,
Higher manufacturing costs,
Harder for drivers to negotiate obstacles (due to three wheel tracks),
Drive and transmission arrangements are more difficult to package,
Entry / exit arrangements are likewise,
and most importantly...
potential customers thought it was a joke and none wanted to buy one.
Strangely , vehicle handling was pretty much unaffected.
Peter.
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