What are these

[pizza_pablo]

And what do they do?
Only on passenger side. Outside the frame rail about the center of the front door.
They feel like stone or cement.

 

[vincentw56]

And what do they do?
Only on passenger side. Outside the frame rail about the center of the front door.
They feel like stone or cement.

Vibration dampers. They try to keep the vibrations down when the truck is in MDS mode.

 

[CHeYeNNe71]

 

[pizza_pablo]

Cool. Thanks!
Crazy that they are just on one side, unless they're in a different location on the port side