Today on our 2013 Acura RDX, we'll be test fitting the Thule Sonic Medium rooftop cargo box, part number TH634B. We'll begin our test fit by placing the cargo box onto the vehicle's crossbars. After positioning the clamps over the crossbars, we'll unlock the box and open the lid, exposing the two closest knobs. We'll turn the knobs to bring the clamps up around tightly against the load bars,… see more >