remember the spoilers they used to put on the back of the old safari wagons on the luggage racks ?? thats what they do they pull air down into the void and break the vacum , you could try the wide rubber mudflap trick ( from side to side) as this will cause the air to go around the front of the bottom of the trailer instead of hitting it making it go up ,it thus pulling the air down thru the gap instead of rolling around .
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