Aright so I have a 2013 F150 Supercrew Xlt. I would really like to put a 10" sub in the back but one that would fit under the seats. Im not trying to spend a ton of money, probably around $300-$400 for the whole setup. Does anyone know of any good websites for enclosures that would fit under the back seat? Also does anyone know if there are RCA jacks on the back of the head unit? I have the 4inch screen (not touchscreen one). Any comments on anything would be great. Thanks!