Greetings and grace to you,
I ran 2 bars and I believe it is a very good method of sway control... my trailer was 31 ft long. It’s more the aerodynamic load on the side of the trailer than the trailer weight.
However, please beware that what you are trying to prevent is the wiggle from passing vehicles, road irregularities, and wind. Sway and wiggle are not the same thing. Sway is the sever oscillation (tail wagging the dog) and should be dealt with directly. Balance the trailer and make sure you have 10-15% tongue weight with a (My Preference) sweet spot about 13%. Set up the weight distribution hitch correctly. THEN add the sway bar/s.
Resist the urge to fix sway with sway bars if at all possible. You fix sway in the set up of the entire rig.
WD hitches are not difficult to set up. E-Trailer has some excellent videos as does Curt and a few others on YouTube. Read your specific instructions and enjoy the ride.
I personally prefer the standard WD hitch and add on sway controls. I feel it gives me more flexibility , cheaper to purchase, and more likely to get replacement parts on the road if needed.
Thanks and best of luck to you!
Jeremiah