Well, I am having the same vibration problem in my 2019 Ram Tradesman, that started around the 200 mile point. I am now at 4100 miles, and all the trips back to the dealer thus far, have resulted in no change in the vibration. I will be taking it back in to the dealer tomorrow for the 4th time, for the same annoying vibration.
It starts occurring at about 58 MPH. Road Force balance and a tire replacement did not correct the problem. I am becoming thoroughly disgusted with this whole ordeal. The last "Dodge" Ram 1500 that I had for 15 years, was never a problem, and actually ran and rode like it was new, on the day I sold it. I never even considered, or looked at another truck brand, for that reason. I am (maybe WAS) a loyal Mopar customer. I have been dealing with this since last October, and quite honestly it's getting OLD !
If the dealer can't fix the issues time, I will be forced to consider my options. I have neither the time or the inclination to keep pursuing this sad situation. I don't know whose problem this is, but I know whose problem IT IS NOT !