Mine is mounted under the tongue and even with the low ground clearance of the 23B I've only had one instance of it rubbing. The usual culprit...low dip in the pavement at a gas station. No damage other than some missing paint.
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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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