spoilers
Daq,they might be worth a go.Mercedes did this sort of thing before and it made a showing in their wind tunnel.
End-plates would help prevent adulterated flow,in from the sides.They would also give some structural reinforcement.The captured vortex created,would help give you some 'phantom' aft-body.
You WOULD have some 'blind-spot' and you'd have to rely on your mirrors a bit more.
The extra length is always welcome as far as air is concerned.
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