I owned a '99 Dodge Dakota (v6) when we purchased our #3500 (GVWR) trailer. With a payload of roughly 900, and tow rating of 5,000 I knew I was pushing the numbers.... A WDH was a must have.
Fast forward...RAM 1500 with over 1600 of payload, I think 10,000 tow?????? I still hook up the WDH. I figured I already own it, the anti-sway alone was worth the install.
I have towed with it and without it (just wanted to feel the difference---so I left the bars off on a short trip). Not a lot of noticable difference as far as squat or loose steering. BIG difference with sway and porpoising.
I say go ahead and use it....makes for a smoother ride.