Foam cushions (or barrow the cushions from your couch) between the insight and ply, and some lashing to keep them atop the car. for 1.3 miles you are likely not going to go fast enough for the aero penalty, nor to cause much lift.
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Learn from the mistakes of others, that way when you mess up you can do so in new and interesting ways.
One mile of road will take you one mile, one mile of runway can take you around the world.
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