I'm not sure that CR recommends any slide lube or maintenance. What I do is slide a piece of cardboard on top of the slide out bars to protect the bottom of the slide. Then I brush the teeth to get any big chunks out, if there is any there. Next comes the WD-40 I usually wash it down pretty good with that then wipe off the drippings and over spray, let it dry so none gets on the carpet and should be good to go. I don't really think it needs to be lubed, but I feel better keeping the teeth clean that way.
2013 Ford f150 Eco Boost tuxedo black
Reese Select 16K