I'm perplexed by your indifferent results. The Trailer Tail[tm] seems to work Okay.
I'd try a curved panel (pace Mair) that could have an overlap onto the van, with the 1/4in edge beveled, sealed with aluminum tape,
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.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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.Three conspiracy theorists walk into a bar --You can't say that is a coincidence.
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