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Today on our 2009 Ford Fusion we'll be test fitting the Thule Sonic XXL Rooftop Cargo
Box with 22 cubic feet of space, metallic silver in color, Part Number TH636S. With
a Thule Rapid Reverse Roof Rack System on our vehicle, we'll begin our test fit
by placing the cargo box up onto the vehicle's load bars. After positioning the box to fit
over the bars, we can unlock the box and open the lid exposing the two closest knobs. We
can turn the knobs to tighten on the clamps up against the front and rear bar. You'll
know when the clamps have been fully tightened down when the knobs starts to click. We can
then move to the other side of the vehicle and repeat the same process.