Do you mean A/C unit on top? If so, is the roof sagging where the unit is mounted? Stretch a length of string across the roof using a helper and see if there is a gap by the A/C. I believe the factory just cuts a hole in the roof and installs the unit as well.
My old pup carried 5 bikes plus a metal bike rack on the roof with no issues.
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2006 23B Hybrid with 10k round bar WDH
2011 F150 4x4 SCREW Ecoboost, Max Tow, Integrated TBC, 3.73 LS axle, Firestone Ride Rite airbags.
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