Without seeing your cabinet, it's hard to give advice. Often you may have to disassemble to some degree and see how it's attached. If it's not accessible, you may have to drive some additional screws into the roof. You may need to use a plate inside that connects the screws together and gives you a continuous support, rather than just at the screws.
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Don & Mary
2019 Newmar Dutch Star 4018 (Freightliner)
2019 Ford Raptor
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