The vibration issue is real.2016 2500 wt. Between 45-65 mph. Low rpm, louder on a hill. Took it to the service center 3 time . First visit, they put 18" michelans on it and a piece of dynomat. They claim its because the noise canceling in the wt's is insufficien . They claim its a 4th wheel vibration with drive shaft vibration amplified and it shows up in the cab, and felt in the steering wheel and pedal. This is unacceptabl . This vibration has not been diagnosed long term for potential wear issues post warranty. Also, vibration sickness is a real thing. The reverberation inside the cab is distracting and unsafe, and makes the vehicle unreliabl . BBB is involved and we are going into arbitration. Note... When the BBB claim is filed , expect GM and your dealer to flee. They will treat you as the bad guy, be useless, offer you nothing, and direct you to GMs claims office. Have your facts in order from day 1. Record dates, take it to your own Certified mechanic, record all conversations relating to the diagnosis of the vibration. Be prepared people. Chevy nerds to recall these truck .