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In theory neutral would be best. In practice it would depend on which end has the drive wheels.
Fuller's original Dymaxion (reverse trike) design was a tail-dragger that lifted the third wheel and drove and steered with fronts. Jocko Johnson stole the idea for his Triple Nickel speed record car, but he didn't live long enough ti instantiate it.
I can't think of any other counterexamples.
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.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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.Impossible is just something we haven't done yet. -- Langley Outdoors Academy
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