How bad is the vibration on a scale of 1-10. The reason I ask is because since I've owned my 2017 Sierra, I've noticed a low humming sound at slow speeds and at times I can see the passenger seat belt vibrating. So I'm wondering, if it's typical road noise, surface conditions, or am I experiencing the same type of vibration issues others are complaining about?
2017 Sierra Denali Ultimate with 12K miles.