I'm a Blue Ox fan. I had a Reese 10,000 pound PRO Series hitch for a number of years, relying on the truck electronics to help control sway. But in time i looked at the Reese Sway Kit, however, the issue with that kit is having to rely on lag bolts that you drive into the tongue of the trailer. I have an all aluminum ATC 24' car hauler that weighs ~7,216 pounds when I have my '67 Hemi car on board) and I wasn't prepared to be drilling/lag bolting into the aluminum tongue.
In discussing the situation with the Parts/Service Manager at Standen Springs here in Calgary(they're one of the largest spring and steering shops in the world, so they know a thing or two about such things) he suggested the Blue Ox, and I'm very glad he did.
The day after it was installed I headed to a car show in BC, so making my way through the Rocky Mountains. The difference was amazing, and it's all in the design of the hitch head itself. There is camber built into the head right where the bars attach. There's some serious science in this, thus my reason for highly recommending the Blue Ox.
What you could do is see if your local hitch shop will let you try the Blue Ox out for a few days, that way you can see it for yourself.