Unfortunately the aftermarket protection for the KL is limited.
We like our RRO rails. Ours have the optional step and cover. This does a few things, keeps on and off pavement obstacles away from our doors and provides a nice step to washing the top of the vehicle, also keep rocks and stuff fm flying up and chipping paint or cracking the running board. The sliders, due to removing the plastic running board piece, provide a tad more clearance as well. Now they are offering "kicker" sliders where the slider comes out a little bit towards the rear to better protect that area.
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