Welcome to the Forum. You may want to post your question in the Voyager and Town & Country area of the forum as it's a very active area with many owners from both sides of the Atlantic who hang out there.
As for your question, if you bought the car second hand, you may want to take a look underneath to see if a previous owner installed different springs or shocks (maybe to boost trailer towing) that stiffened the ride. Check all your weatherstrips around the doors. If they are missing or out of place, you could get some road noise in that way.