Thule Sonic Medium Rooftop Cargo Box Review - 2011 GMC Sierra Video

Review of the Thule Sonic Medium Rooftop Cargo Box on a 2011 GMC Sierra

Today on our 2011 GMC Sierra, 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 load bars. After positioning the clamps over the load bars, we'll unlock the box and open the lid, exposing the two closest knobs. We'll then turn those knobs to bring the clamps up around tightly against each bar.… see more >