The Pro Series you are looking at will come with TWO built in mounts for TWO friction sway control devices.
With a 30 ft trailer you will need to use both of them. There should not be any sway if you load the truck, trailer, and adjust the WD hitch properly. There will be some "wiggle" from passing cars and wind, etc... One sway bar will take most out.. two sway bars will take nearly if not all of the wiggle out.
Here is an old pic of my hitch with dual friction bars and a 31 ft trailer.
I pulled thousands and thousands of miles with that old set up. Never, not one time, any hint of sway.
Some like the integrated sway control hitches like the dual cam or the Equal-i-zer, and those are mighty fine hitches. But something to think about is the availability of replacement parts when you are at a campground.
What I mean by that is if you break something on a Dual Cam design or Hensley, or Equal-i-zer not every local RV dealership is going to have parts.
If something goes wrong with a standard WD hitch and friction sway control ANY RV dealer in the nation will have a replacement part that will work.... example.. you lose a snap up bracket pin (you should have a few spares of these anyway), a quick run to any RV dealership should have some available. A broken DC arm may not be easily replaced at most dealerships...
Even if you break a Sway control bar just about any dealer in the country should have one you can use. I had Husky sway bars with a Draw-Tite WD hitch.. so parts can exchange easily on a standard WD hitch. You can even use different brand snap up brackets. Its pretty neat how modular the standard WD hitch is.
just something to think about.
Jeremiah
