Rolling.Those grills make a nice difference. I plan to do mine soon with the OEM upgrade. I also plan to use plastic gutter screen on the lower air intake openings to keep out small rocks, etc. Not sure how I will mount the screen, maybe Gorilla glue, etc.
I put Pet screen between the grill and condenser on all our cars.
Its pretty tough and does not seem to hinder airflow.
Keeps the bugs and rocks out of the fins.
But the lower openings on the bumper are still open.
I did the OEM upgrade grill.
It really changes the look of the truck.