Honestly I think I'm gonna try for two vented under the rear seat. I've messed around with the sub in a few different boxes and it sounds amazing in a small spec vented box. I think I can make it fit under the rear seat based in the required air space.
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Are you going to take up the whole space under the seat, or just one side? I'd be willing to give up the passenger side, but not so much on the driver's side. I like to have flashlights, etc. under there for easy access without rolling around the cab of the truck. If it can fit behind the seat that is even better. I'm not doing anything to the factory mids/highs, so I think a small sealed behind the seat will probably add more than enough sound. At least as much as the factory mids/highs can hope to keep up with. I typically like the extra punch you get out of a small ported enclosure as well, but finding space for the port would be more difficult I would imagine. How are you going to arrange them under the seat?
Unfortunately I'm used to interior space of my Excursion, so storage solutions for all of the crap I tend to keep in a vehicle has been a bit of a trick to figure out going back to a pickup truck. I've got a full system in the Excursion, but the factory system in the new truck isn't totally horrible. A little extra in the form of bass would be nice though.