Believe it or not, these lights are the perfect sized to mount onto the vertical rods that support the lower grill. They were essentially "zip tied" tightly to a vertical rod at each end of the light.
The wires were fed through the lower bumper and up into the engine bay. You have to drill...
My Ford dealer acquired two replacement cables. The second one did the trick. Apparently, the tailgate/box setup measurements are different between the right and left side. I am glad that there is no slack now on my left side. You should have it fixed because you want to have an even...
Basically align one end and trim the other. Questionable on the adhesive being strong enough to attach to bottom side of the bumper since it didn't come with adhesion promoter.
I managed to use 2-2x10s with a velcro strip between the length of each piece. I also added rubber gaskets to the back side to prevent bumping and spray-painted them black.
They were swapped out shortly after taking delivery of the truck, so I wouldn't know if it affected the mpg. The tire is a a little wider than stock at 235/65 R17.