Here is something that is taken for granted. You put the carnauba wax on the outside of the slide out when the bed is out. If you look under the slide-out when the bed is out, you will see marks where the slide-out slides over the three teflon runners. Move the rubber seal and you can see the telfon slide blocks. Where the marks are on the bottom of the bed slide-out is where you put the carnuabe wax. I did this and there was a dramatic difference. You can also put the wax on the other end of the slide where the front teflon blocks hit. This has to be done when the bed is in.
This took a while for my pea brain to understand because I didn't relize that you apply the wax to the underside of the outside sliding room. There weren't any marks and I couldn't see the outside teflon blocks so I really didn't know what everyone meant by waxing the slides.
Hope this helps. It really cut down my noise.
2004 National RV Dolphin LX, 6355, 35', W22, 8.1L, 1997 Jeep Wrangler, TJ, 4.0 L, 6" Lift, ARB Lockers F&R, 35" Tires, 2000 Jeep Cherokee, XJ