smaller sub, or a single sub like the triple X, and mount it somewhere like between the front seats. just remember for a ten, you'll need about 1 to 1.5cu ft NET volume for the enclosure. that's after driver displacement is added to the box, and port volume if applicable is added too. that means gross volume is more like 2 to 2.5cu ft or so. that's a fair bit of space in a single cab truck. even a full size like yours.