Yea that's my truck. Here are the pics a lil larger...
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I did this by taking the stock bottom plate out and making a new one out of ply wood that sits nicely like a shelf under the jumper seats. Then I built the box that you can see and installed it into the shelf. Then made the lid which I made mount the sub flush so that the seats can still fold down. Then added some spray on bedliner to the lid, put the sub in, and now your bumpin!