Totally understand, and there's no reason for that.
Mine is a '14, I went through the vibration on the highway thing. Couple sets of good years, a set of Michelin's. The vibration would go away everytime they worked on it, but eventually come back. I figured there's no fix so I decided to lift it and install bigger tires, my thinking was if it's gonna vibrate like it has big tires, might as well look cool and go where I want it to. I still pick up on it from time to time, but I think it depends on which way the wind is blowing. LOL. Good luck to you bro, hope yours gets resolved.