I also never heard of Kevins.

I have the Rocky Road Super Sliders, and they sound exactly like what you are describing. They have the square tubing underneath and they stick out. While they are sold as also being a step up to the roof, they only stick out far enough to put my toes on, so they are semi-useful for that, but not much.

If you do not already have them, I will warn you that they are a very difficult install due to the angle of the holes that need to be drilled in order to mount them. There is not enough room to get a standard drill head in the area to make a straight hole. I had mine welded to fix this issue, and because on previous 4X4s I beat the snot out of my rocker panels. I wanted these extra strong. So far so good.