How about calling up the dealer and asking? I'd LOVE to know the explanation for that one. The only pressure differential I can imagine is from the wind pushing on the front of the trailer as you drive, the suction behind the trailer, or the Bernoulli pressure difference from the wind slipping along the side of the trailer. I'm not sure why one would want to "equalize" any of those pressures - and I'm REALLY not sure how they would be equalized by holes in that location.
Bill
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