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2021 4Runner TRD Off Road Premium, 265 70 17 Yokohama MT G003, Method 316's, 35% ceramic tint front windows, blacked out emblems, Overlay Graphics American flag on rear windows, RCI sliders and engine skid plate and rerouted exhaust pipe for now.
Hmmm.. There used to be an OEM Rock Rail thread with over 12 pages... but it's gone. Odd.
Anyway, I've got them. They bolt to the frame with 6 bolts per side, are tube steel, and cannot be used for a step. They work with KDSS. I would not trust them to take the weight of the vehicle against a rock (both the tubes and the mounting are not sufficient), but as a sacrificial "first impact" device, they fit my needs. Plus, they were like 200 bucks.