This thread, stuck at the top of the Towing forum, should give you a lot of help in setting up your Reese Dual Cam system. It is an old thread but is still relevant and good today. It discusses not only the proper setting up of a WD hitch but some of the problems that people have, and the solutions, of the Dual Cam sway control system.
I towed my trailer and the trailer before it with the Reese Dual-Cam system. I never had a single problem with a sway or control event in all those years. I changed to a Hensley hitch later on because I wanted to see if all the "hype" was true. It was! :C
I continued to use the Hensley system for many years until I quit towing last year and retired our trailer to a beautiful permanent camping spot.:)
If you take the time to set up the Dual Cam system correctly you will be rewarded with many years of safe, comfortable towing. It is somewhat fussy about things being exactly right on setup but, if you take time and care, it will reward you greatly for doing so.
Barney