I'm having same issue, road or wind-noise starting around 40 mph on passenger size. Annoying because the window /seals right next to my head on driver side is so-quiet. Sucks to have the distraction of more noise on the far side of the cab ( left to right). Could be me, but it seems like noise gets louder as radio volume increases. BTW , mine has the cab to box seal . Its going in Friday , my rear wall molded carpet surround was kink/twisted under the seat from the factory. dealer ordered the part and sound deadening. I don't have much hope as it sounds more from the front door B-pillar area. I think the front door and rear door or b-pillar is being pressurized. Or the noise cancellation doesn't work all that well ..Dealer already adjusted the horrible fitting door gaps ( leading edge of the rear doors were out further than the front doors catching road salt /dirt. not sure if the adjustment made it worse. I can hear a slight change in background noise when recirc is closed, but its still present on the passenger side.
The 2019 rental ram i had for 3 weeks , that helped me switch from GM was so much quieter. Wish i scrutinized the noises more in this trucks test drive , i would have passed on this truck. It was garbage winter weather both days.. I hope FCA figures something out this is the only complaint i have with the truck.. I noticed on my buddies 2018 ram they have a few more seals between the doors and body gaps and the gap between the doors.