This is an easy fix...at both ends of the aluminum square tubing, behind your fender skirts, CC installed 1/16 inch thick strips of flat stock (also aluminum) bent into "L" brackets. This thin material does not support the fender skirt from the road shock very long. Simply acquire some 1/8 inch thick strips probably 1 1/2 " wide by 36 inches long from Tractor Supply, Rural King, Home Depot or Lowe's and replace the thin stuff. I added additional screws on some of them and pop rivets on the brackets at the top of the tubing just to help make installation easier.
2017 F350 Dually 6.7
He who dies with the most tools, wins!