I'll bite.
#1 Where would you put it?
#2 Will JL make a Stealth Box
#3 Does the under floor cubby have enough depth and air volume for a small potent sub?
It's been a LONG time since I've run a real stereo in one of my rides....
Had a custom box built for a JL 10W7 for my Wrangler but never wound up committing to dropping the $$$ a real system build...