Have you seen the fantastic episode of WatchJRGo where they used B-Quiet Sound Deadening in their Convertible Geo Tracker?  JR used B-Quiet Sound Deadening in his Geo Tracker to install a great aftermarket stereo system and quiet the rattles and bangs in the truck.   

By adding B-Quiet Ultimate to the floors and doors, he was able to absorb the vibrations from the tires, engine and wind noise making its way into the cabin, and Although this Tracker is a softop, the difference in road noise was remarkable.  Check out WatchJRGo and be sure to give him a follow on Youtube.