How thick is the Nylon rubbing strip that's currently installed on the rails? A 1 cm. thick strip is not a thin strip; 1 cm. is equivalent to 0.39" and that's a lot thicker than 1/4" or 0.25".
If the bottom surface of your bed rails is flat and smooth, I would think that 10 mil thick UHMW tape should do a fine job of providing a low friction sliding surface. If the bottom surface of the rails is not flat or smooth, consider attaching a length of aluminum angle to it and then overlay that with the 10 mil UHMW tape. A 1-1/2" x 1-1/2" x 1/8" thick aluminum angle can be securely screwed to the rails with countersunk head screws - and this combination would be less expensive than purchasing lengths of solid UHMW angles. Another advantage of using this combination is that it would be easier to apply the UHMW tape to the aluminum angles before you attach them to the undersides of the rails.
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