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Or get a kicker slim line 12 inch sub, that's what I have behind the passenger seat in my VS ute...
That accompanied with some kicker splits in the door sounds aboslutely perfect in my opinion...
I find it perfect for a cab, after all it's literally half a meter from you, you don't want it unbearable.
Don't get me wrong though, if you turn the bass right up you can shake everything from your rear view mirror to your ear lobes. But tuned properly accompanied with some tweeters it sounds awesome.
All my mates agree it sounds better then all their twin 12 inch subs in their sedans!