upper splitter
If the top of the trailer is taller than the tow vehicle the splitter could create some positive lift,especially in a crosswind.
The air won't be able to bleed 'up',and as the dynamic pressure acts on the underside of the splitter it will be pushing upwards,affecting tongue weight,stability.
Something more stable,would be to split a 8" PVC pipe and attach the halves to the upper edges of the trailer face.This would be incapable of generating lift.
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