I had a similiar problem with an overhead cabinent. I lugged a 1x2 piece into the cabinet at the top, and then used that piece to support two toggle bolts for added support. That worked for us.
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Mike and Lorraine
2002 3655 FL, 2005 3650RK
2010 3665RE, 2015 3910FB
F350 crew cab dually 6.7
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