How about a sheet of hardened aluminum ( 1/8") the size of the A/C unit, placed under the A/C unit on the roof. Seal the edges and cut the same 14" x 14" hole in the center. It wouldn't be visible to anyone and would probably displace the weight enough to solve the issue.
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Don & Mary
2019 Newmar Dutch Star 4018 (Freightliner)
2019 Ford Raptor
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