Today on our 2012 Toyota 4runner well be test fitting the Thule Sonic Medium Rooftop Cargo Box, part number th634b. Well begin our test fit by placing the cargo box onto the vehicles load bars. After positioning the clamps over the load bars, well unlock the box and open the lid exposing the two closest knobs. Well turn the knobs to bring the claws tightly up against the load bars. Youll know… see more >