I have some direct comparative experience with this stuff. We've got 9 minivans in the fleet including '91, '92, '93, '94 Caravans and '02 T&C Limited. The '94 was the best of the early batch stock. The '02, being a Limited, has all of the sound insulation you can get on one of those things and beat all of the early ones. The '92, which is my wife's daily driver, has had a lot of sound work done. Brown bread (Dynamat clone) on the entire floor, up the firewall, tailgate, side panels and doors to window level throughout. Foil backed jute behind all of the interior panels from window level up and the entire roof interior. Expanding urethane foam in all interior and exterior body cavities. Lead lined foam from top of interior firewall to floor at front of front seats. Various later model door seal upgrades. All hard plastic interior panels covered with carpet (thin "car" grade flexible able stuff, but still absorbs sound). Result is that this one is now quieter than the '02 and has interior noise comparable to an '03 Deville DHS (high trim line, not the bottom feeder stripper Deville) that one of my uncles drives. The difference is quite noticeable and quite worthwhile. This isn't just a subjective "it sounds better" judgment. I have a good dB meter.
I haven't done much of that to the CTD except for foil backed jute inside of the door panels. And if I drive that more than about 20 miles I use ear plugs. I don't use it enough on long trips to make it worthwhile to sound proof it. If it were a daily driver I'd go through it entirely with every piece of sound deadening I could get. But I don't have to drive a pickup of any variety that often and I don't drive one unless I have to haul or tow something HEAVY. If it's under 3000lbs I tow it with a Caravan. Much more comfortable than any truck.