Noise coming from a WDH (weight distribution hitch) is normal, especially during a TV (tow vehicle) turn. I grease the spring bar sockets in my WDH ball mount to reduce noise, and place a quart size freezer bag over the greasy end of each spring bar when not in use (one freezer bag lasts me a camping season).
If you have the Reese Dual Cam WDH you can put a "dab" of Vaseline (not grease) over the came surface to reduce wear and noise...., which is more prevalent on the heavier loaded tongue weights.
As far as the standard friction control sway bars, do not apply any type of lubricant to the friction pad surface and remove the friction bar when backing into a campsite. As stated, they can be a little noisy at times.
2016 GM 2500HD 6.0L/4.10
2005 Jayco Eagle 278FBS
Reese HP Dual Cam
Putnam Class V