I'd personally leave them open- add some 3M brand grip tape (available at Home Depot) on top so you don't slip, and go like that. The plastic covers will trap and hold dirt, leading to corrosion. You can't really see it in my picture above, but I cut my rock slider because there is a (factory) roll door behind the drivers door for a propane tank (originally- now I have a fuel can and fire extinguisher in there). But the point is, I had a piece of heavy wall tubing bent around to protect the door, and added grip tape to the top of the bar. Now that, and the lower roll cage bar, act as a second ladder to the roof. I also added black reflective tape to the roll cage. It is "invisible" during the day and provides good visibility when lights hit it at night.Some additional views (featuring Prospeed and Front Runner Accessories added)
Most certainly appreciate the look and ruggedness of the Prospeed Rock & Tree Sliders over what were the OEM LR side steps!
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Note: in the photo above, the Prospeed ABS step inserts have yet to be installed as they are on back-order. Once installed, the topsides will be fully enclosed providing a safe footing platform.