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

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

Today on our 2011 GMC Sierra, we'll be test fitting the Thule Sonic XXL rooftop cargo box, part number TH636S. We'll begin our test fit by placing the cargo box onto the vehicle's load bars. We'll position the clamps over the load bars, and then we can 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… see more >