My first thought for any vibration felt through the steering wheel is out of balance wheels. After that there are many possible causes. With a new truck I would probably rule out worn parts but there is still a possibility of other out of balance drive train components such as a drive shaft.
Also, new Rams come with
active vibration dampening so there could be a problem with that system causing vibration or failing to cancel it enough.
This story says one of the functions of the active vibration dampening is to counter the slight imbalance that occurs within the motor when MDS activates.