There is not a helluva lot of room under the rear seat. Where are you guys installing your subs? I just dont want to have to sit the box on the rear seat as sometimes I have passengers back there.
Craig

 

Well there are a few options here. You can buy/build a box that will go under the seat(the seat has to be lifted). Only bad thing with this is you dont have very much mounting depth, which may or may not be a problem depending on what sub you are using.
2. Take out the whole back seat and replace it with a big strong box that passengers can set on.
Or 3, take out the 40 section and put a box there-you will only lose one spot.
And finally-do a cut through. If you dont need all your bed room, want something really cool, and something where you can put a tone of subs in-this might be the way to go. Although cutting a hole in the back of your cab and front of bed may take a little work

 

Bartak1 pertty much covered it. I all depends on the level of bass you want. Most here have been putting either 2 8''s or 10''s under the rear seat with good results. You can either build your own or buy a custom fit box. Most of us here have been through it all trying to get subs to fit, so ask away.