My last WD hitch weas a Reese Dual Cam. First step was getting the proper spring arms for the expected tongue weight. Then it was adjusting the chain length on the sway control so that my front fender didn't raise more than 1". I did the initial setup with empty truck and trailer, and usually didn't have to make any adjustments after that. If I did, I only had the shorten my chain by one link.
I used this hitch for two different travel trailers. The first was about 7000# empty and the second was a little over 10,000# empty. I only had to change the spring arms for the heavier trailer.
There are multiple brands and style of WD hitches, but I found this video helpful in explaining how they work and how to set up. In my mind, the measurements taken would work for any brand.
https://youtu.be/ZHYTw9e5oIY