Every DU-HA is custom designed to fit a particular model of truck. The DU-HA for Chevy/GMC Crew Cab (new body style) trucks is designed to fit underneath your pre-existing back seat. It's constructed from heavy duty polyethylene and comes with a lifetime warranty. This model also acts as a legal gun case in most states and will hold up to 3 rifles or shotguns, 1 with scope. Scroll down for more photos and information on this DU-HA.