I have a 2019 Ram with 38K miles and made this humming/vibrating/exhaust came loose from the header sound over the weekend. Intermittent, sounded like I put glass packs on my exhaust or cut-outs in the system. Would be fine for a few seconds, then make the grown again. I have driven it a couple times since and it hasn't made the sound since.
Made an appt with my local dealer for this morning. I was explaining the sound to the "consultant". He told me if it was not making the noise now there is nothing they could do. I asked if Dodge was aware of this since there are plenty of people on-line complaining about it and he said he wasn't aware of it and that googling solutions on-line is not what they spend their time doing. I told him I am not being a smartass here and he told me that it sounded that way to him.
I walked out of the dealership and will never go back. I have never wanted to trade off, what otherwise has been a perfectly good vehicle, more in all my life...