So I'm not totally understanding what a WDH does and when it is needed.
It does what the name implies - it helps distributes the tongue weight more evenly on the tow vehicle. Without it, the trailer tongue weight falls directly on the hitch receiver and through it onto the truck rear axle. That hitch receiver and the back end of the truck can carry only so much weight, though in the case of a Ram 2500 that is substantial. [See the weight-carrying and weight-distributed ratings for your truck's hitch receiver.] A WD hitch uses spring bars as a lever to shift some of the tongue weight forward on the truck, so that the receiver has only a percentage of the tongue weight on it, with the rest shifted to the front axle of the truck.
If the weight-
carrying rating of the trucks receiver exceeds the actual tongue weight, you don't
need WD. However, if its close, WD is at least a good idea, and if it exceeds the rating WD is required. You also want to be sure that the total weight carried on the truck rear axle is within the axle rating (GAWR), and the tongue weight is a substantial part of that (the rest is cargo and passengers in the truck). By shifting weight forward, WD relieves some of the load on the rear axle.
Example: A typical Class IV receiver is rated to
carry 1000 lbs and tow 10,000 lbs. With WD, that typically increases to 1400 lbs of tongue weight and 14,000 towed. The gain is a result of the weight shifting.
https://www.reese-hitches.com/learning_center/general-towing-classes
The better WD hitches build some sway control capability right into the hitch, while others attach a friction device on the side. However, you can install a friction anti-sway device on a ball coupler hitch without WD. If your truck doesn't need WD to help carry the tongue weight evenly, an add-on anti-sway device is the solution. [Whether you need an anti-sway device at all is another question, one that we can discuss separately once the WD question is answered]
This URL shows an friction-type anti-sway that connects to trailer and the ball mount.
https://www.etrailer.com/Weight-Distribution/Pro-Series/83660.html