Anyone running Kicker CVT65 6.5" subs in rear access cab doors?

I'm looking at 6.5" "subwoofers" to install in my 2nd gen access cab's rear doors. Has anyone ran the Kicker 10CVT654 or 10CVT652 subs in this application? How do they sound? I have amplified Polk MM691 6x9's in the front and honestly don't know if the 6.5" subs would be worth the time and money. I also have read good things about the Tang Band W6-1139SI 6.5" subs which should fit but are more expensive. I would love more bass in my system, but sound quality is my number one priority...I would love to hear people's experience with the performance of these particular subs and how they compare to other setups.

 

Nobody have experience with this I would love to hear thoughts also