Quad Subwoofer Subwoofer For My Quad Cab Pickup?

Subwoofer for my quad cab pickup? - quad subwoofer

Hello, I have absolutely no idea about the radio and sound equipment, I do not know that I have a 2005 Dodge Dakota Quad Cab, and I'll buy subwoofer (s) for this, but I must be behind or folding chairs for the use throughout the backseat the whole time there are spaces behind and under them, but if someone knew that to achieve and if possible to do what I want
Thank you very much!