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Wetted area would be surface area and the concern there would be skin friction, which Aerohead says is a quite small component of drag for land, or should I say street vehicles. Of course for competition vehicles no stone should be left unturned and they will seek to get competitive advantage whereever they can.
I'd be interested in what he had to say about junction interference but I'd imagine it isn't real deep; we can see from the aviation world how they treat the wing/fuselage junction, and also the tail/rudder/fuselage junctions and they are either dealt with with fillets of modest size or nothing at all. An example from the marine world would be the sail and sail planes on a sub and there too the junctions have modest fillets.
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