Today on our 2014 Ford Flex, we'll going to be test fitting the Thule Sonic Medium Rooftop Cargo Box with 13 cubic feet of storage space in Glossy Black. Part number TH634B. With our Thule Rapid Crossroads Roof Rack System already installed on the Flex, we'll begin our test fit by placing our cargo box directly on to our load bars. We found this is the best time to get our feet lined up so that… see more >