Well I have a 03 F150 ext cab with the folding seats. I kinda had the same Idea looking for something to secure a AR under the back seat.
I found this trunk set up from santa cruz http://www.santacruzgunlocks.com/set...ete917-mr.html
You can turn the rifle 90 degrees on it side and its lockable.
But I have not found any measurements on the site guess you could E-mail them for the measurements to see if it would fit.
Only thing it doesn't look to be optics friendly and you have to be using the standard handgaurd slip ring.
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