Sorry Fred, didn't mean to spread misinformation in your thread.
Typically a rock slider will bolt to the frame since it's much thicker and is less likely to bend as the weight of the vehicle pushes against the slider. If you bolt directly to the body, similar to most running boards, when the weight of the vehicle is pushing up versus the weight of a person is pushing down, you will bend your sheet metal. Jeeps do have this option and possibly other manufacturers where there is thick metal that bolts directly to the sheet metal and do function perfectly.
This is an example of those type of sliders.
I hope yours work well and if they do I'd love to add them to my F-150, but be careful before using them as a slider, that's all.