2015 RR HSE with 84k miles. There is a dull mechanical hum (not tire sing) coming from the driver’s front wheel. It only happens on rougher surfaces/hard concrete roads. The hum is still there on black top roads but not nearly as bad.

Truck drives straight and supper smooth. Rough road noise is present while cruising, braking, not braking, accelerating, decelerating, turning, not turning, and even in neutral. We’ve rotated tires twice and even had our mechanic listen to the wheel bearing on the lift. Nada.

I’m guessing a suspension component is worn somewhere.

Which parts would you start replacing first?