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Instead of a wall, why not build a pillar?
On the passenger side in the back, remove the small seat (leaving the larger part of the rear seat) and build a little pillar in that corner of the truck. You should have room enough for 4 12s if you stack them vertically, and plenty of air space depending how far forward you have the box extend. Imagine a floor to ceiling box that fit nicely in that corner of the cab... I dig the idea.
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