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I have this Pionner 10" sub that's rated for "free-air" use. Got it free from a package deal. Want to keep the rear folding seats which makes the whole free-air idea worthless. What kind of a box could I put it in?

 
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you could put in into any type of enclosure you wish. I personnally prefer the pound of a well tuned ported box. Others prefer sealed because its simple, fast and has a clean sound. JL has a good web site on the pros and cons of different designs:

mobile.jlaudio.com/support_pages.php?page_id=141