Just wondering if anyone might know if my 08 2500 quad cab has a double walled roof? Im looking to install a Big Sky Overhead Gun Rack from Cabelas in it. I'v heard a lot of good things about them and think it would be a nice addition to the truck. But in the ordering directions they say you need the double walled roof for them to be installed right. And i cant find any info anywhere on whether or not the rack will work in my truck. Any insight would help! Thanks.