Im very interested to hear what they diagnose for the rattle. My 2018 is doing the same. I have noticed a bit of seepage on my front driverside shock. When I get home later this week I'll be taking it into ford as its still under warranty.
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This is decidedly NOT even treadwear that is excessive on the inside. Every other tread block (on the inside) is more worn than the one before or after, and more worn at the front than the back of the tread block.
(and therefore get that inside edge of the front tire to the outside after rotation)
It is hitting a pothole, road seam, join in the pavement, or other very small but sharp road imperfection that I hear it. It's at it's worst on a wash boarded dirt road, or a rocky jeep trail.