We have a 2017 Pacifica with 19K miles. For sometime we have noticed a low "thumping" noise while driving the vehicle. It is very annoying and seems to be at all speeds. I have had it back to the dealer 3 times and I had the salesman and one mechanic accompany me on a drive so they could hear the noise. They both confirmed they did. The tires have been rotated (again), front bearings checked, tires balanced (again), and then did a "force test" on the tires and rims (never heard of such test). They said that they found an issue on the force test and re-positioned the tires on the rims. It seemed a little better but now it is back to where it was. This is getting very frustrating. I have owned three previous T&c vans and this one makes the most road noise. I thought they were supposed to be quieter for 2017. Anyone else experienced the problem?