Aerohead,
I am also surprised there wasn’t more gain for the length; I would wager a guess that maybe the other drag components (like non-faired tires) took over? It also looks rather aggressive in the back and the edges look rather sharp.
I had thought about a folding boat tail mounted to the rear doors, but even with a folding version I would end up somewhat length limited for practicality reasons. I am imagining something like the drawing of the lower jeep, except that the sides and top would fold in. But if I could get the drag reduction I wanted without touching the existing bodywork that would be great. I could even camouflage the folded in boat tail and make it look like an exploration style rear ladder/tire carrier add on.
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