Question about sound deadening/proofing

Tried to search for some answers to this but here are some of my plans...I want to eventually get a Mr Marv box for my DC to fit behind the seats.

Assuming I get 10's or 12's - something with enough power to fill in the low end, I listen to mostly rock with some rap tossed in so I don't need neighborhood waking bass, would I need to put up sound deadening mats across the back panel?

I've read several threads were people have talked about vibration problems but they never say how bad it is and if the vibrations are in the door panels as well or if you just deadened the back wall then you'd be fine? I'm slowly understanding the process of doing audio installs but I have never put an amped sub in my vehicles, just HU's and door speakers.

 

i only have one 10" but i dont have any rattles. but i still plan on rattletrapping the iterior

 

it's called peel and seal, and makes your truck smell like tar.