I've had this issue on my 2019 1500 classic. Had into a dealer and they rebalanced the tires with no change. Brought it to another RAM dealer and they once again Road Force balanced the tires and no change. Brought back and they said all 4 tires had flat spots on them and it was a Goodyear warranty issue and they needed to be replaced. Brought it to Goodyear. They checked the tires and found nothing wrong with them but they followed RAMs recommendation and replaced the tires, balanced them and front end alignment. Still same issue. Brought it back to RAM where they once again Road Force balanced them and told me one of the brand new tires was bad and needed to be replaced. Brought it back to Goodyear and they found nothing wrong with the tire but replace it anyway as it had 100 miles on it and said they felt bad for me and it would eliminate RAMs concerns. Still same issue. Brought it to yet another RAM dealer where I was told my truck ran mint and all the others were much worse, they all have the vibration. I have a case open with RAM and they are supposed to get a rep out to look at the truck this week. Have not heard rom them yet. By the way, this last service manager said it was definately not the tires causing the issue...