They probably used one of those receivers that everyone welds under their rear bumper to install bike racks on. A chunk of 2 x 2 square stock and a ball coupler from TSC and your good to go.
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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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