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What about the AMP POWERSTEP XL, it looks like it would deflect some mud and rocks?
PowerStep XL | AMP Research
Only if they were extended whick would defeat the purpose of having retractables.
Tone
This avalanche SCAB has them installed. I found it on youtube.
https://youtu.be/v44yLKQ5Phk?list=FL5um7a4K8PH7uzNTf66G4aQ