I would think Rocket Bunny-style [boxed] skirts that extend to below the split in the tail light. So the lower window and lights are above the box. The hatch could lift out of the addition.
And then a Gurney flap [wickerbill] on the spoiler to wrap the air flow down onto the top of the box.
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.Impossible is just something we haven't done yet. -- Langley Outdoors Academy
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