FCA just bought mine back for the vibration. Rear tires, driveshaft, tweaks to the alignment, calibration of the anti-vibration modules bolted to the frame, trial of other wheels and tires from different trucks on the lot and replacement of the entire rear axle.
The service manager said every one of them on the lot do it but mine was worse.
Clearly something up with this and FCA needs to quit ignoring the issue and find the solution. I loved the truck but couldn’t justify keeping a $74k truck that vibrated between 55 and 65 mph.