a pair of 10 inch or a single 12 inch will leave room for an amp to be mounted on the back wall with whatever else you need. I don't think you have room for too much more if I remember correctly the inside of that truck. Are you tall? if so yu may need a shallow woofer as well. Other than that a cut through is always an option, and if you our skeptical about that and vehicle strength, our shop did a few that were for a bandpass box where only a hole for the port was cut through the back wall only about 5 inches in diameter