2019 Mack Anthem with under 4500 miles developed vibration

613005

{"text":"I bought new Mack Anthem. Now the truck has developed a vibration at 50mph bobtail and about 70mph with trailer. It feels like tire separated but no visible problems on any tire, no mud between rear tires, or anything I can see. Mack said dealer needs to check it out but can’t get in till next week. Was wondering if anyone else had experienced this? What might it be?","pics":"[]","canComment":true}