I used:
Damplifier pro and black hole tiles in my doors
luxury liner pro on the door card
abs vapor barriers
damplifier pro on the door panels
damplifier pro and luxury liner pro on the rear wall
damplifier pro and closed cell foam on a, b, and c pillars
luxury liner pro on the firewall
a layer of dampflier pro and closed cell foam over the entire floor.
I can drive through an under body car wash and cant even hear or feel it. Truck was very quiet to begin with, now its silent. All the doors close with a nice solid sound, no gravel noise permeating through the fender wells. If you just install vibration dampener and nothing else, you are just throwing money in the trash. It takes a culmination of materials but man does it make an enormous difference.