Towhook, I asked the question on Amazon and here are the replies:
Al answered • 18 hrs
Yes, pretty much all step sides will effect ground clearance a little as they attach to the bottom of the frame, however the way these are made they basically double as rock sliders.
jv answered • 18 hrs
They hang about an inch lower than the forward fuel tank bracket which looks to be about the lowest point on the truck.
Tony Ocampo answered • 16 hrs
Not Really.
Brenden G. answered • 16 hrs
If you're asking if they will rub when crawling over rocks, then yes it will affect it a little bit.
Amazon Customer answered • 15 hrs
No axles are lower than these.
papparoux answered • 10 hrs
No more than any other typical running boards... I had the Pro4X so it was a bit higher than the standard truck. Also look super sweet and I haven't seen them on another truck since I purchased, so there is also the 'unique / exclusive' factor to consider... not every Tom, **** and Harry will be sporting these babies!