Just take it easy and don't hit the sliders hard on anything. These things ain't Jeep YJ's where you can slam the belly pan on anything you want to. Even the cheap Westin HDX stuff is better than nothing. It goes "PING" when you bump it.. Back up and try again.
I've seen plenty of frames bent from quality sliders. Frames are soft, high strength, easy to form steel. It's not super rigid to hard wacks on big old, long, steel levers. Heck, I think all 3 manufacturers use hydroforming now. They basically put tube in a mandrel, and inflate it with hydraulic fluid to shape the tube.
You can't trust any slider to hard hits with 8000#'s resting on 2 feet of leverage. 16,000# will bend a frame like a twig. I'd love to see some youtube videos of the hardcore sliders. Maybe if a slider reached all the way across the frame and cradled it like a YJ pan, it could work and be able to hold or lift the truck without applying torque to the surface of the frame. I haven't seen anything like that on a truck ever.