its like anything you can go from mild to wild...
its all about what your going for and how much $ you want to throw at it.
easiest way to get good bass is the jl stealthbox a 10w3v3 downfiring ported. One of the best sounding boxes JL makes!
but if you want to go custom...
there are infanant ideas to go with...i have been wanting to see alot of people do alot of things with this truck.
First of course is money...do you want to do it in steps or all at once?
Second figure out what you can live without in the interior if anything. if you want it to look stock or if you want it "custom."
What if any kind of systems have you had before if any? did you like them? do you want something like them or want more bass or more highs?
off the top of my head in that truck staying toward the conservative/keeping interior somewhat stock but more then a stealthbox...i would love to see someone fiberglass in like 2 8w7 underneath the seat facing out.