Have you looked at the body location with respect to the chassis on these new super duty trucks?
The body hangs quite a bit lower than the chassis.
Because of this, sliders are considerably more difficult to build properly., as that 8k+ amount of weight that they are supposed to support, apply a monster amount of leverage force to the chassis when used.
Ive looked at building a set for my own truck, and wouldnt bother, unless I also built additional chassis cross members into the equation, to transfer that weight from one side of the chassis to the other, as I doubt the open C channel frame would be up to the task without deflection.
All that said, Im leaning more towards a reinforcing of the lower quarters, the pinch weld, providing a solid surface to drop the body on, with the additional of low profile steps. They would allow for considerably more clearance than the true sliders, and under most situations would provide just as much protection to the body.