Today on our 2008 Chevrolet Silverado 3500 Series, we'll be test fitting the Thule Big Mouth roof-mounted bike rack, part number TH599XTR. With the Thule square bar roof rack system assembled onto our vehicle, we'll begin our test fit by placing the Big Mouth directly onto our load bars. Here at the front, we'll loosen up the clamps so that we can bring them around our front bar. We'll put the… see more >