Every DU-HA is custom designed to fit a particular model of truck. The Chevy/GMC Heavy Duty Crew Cab (Classic) DU-HA is designed to fit behind your pre-existing back seat and will not interfere with your seats at all. 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 2 rifles or shotguns, both with scopes. Scroll down for more photos and information on this DU-HA.