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Ensure AV tower is fully assembled. Make sure avionics equipment is turned off.
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Duct tape an unassembled cardboard box to the surface of the trunk. Orient box so that the walls create an enclosure with an open top and bottom.
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Place AV tower into the boxed enclosure in trunk. Ensure the tower is laying directly on the trunk’s surface and has sufficient room to move shake around.
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Drive for 50 yards, increasing the car's speed each trial. Test at 20mph, 30mph, 40mph, 50mph. Drive over bumpy roads to simulate driving through desert conditions, if possible.
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After each trial, park the car and inspect AV tower for movement. Check if avionics has turned on.