Peaeye... Welcome to the Windjammer family!
We used the Equalizer 4 point hitch on our 3065W. It's a nice hitch that does exactly what it is designed to do... equalize the load and control sway.
However, some semi and other large trucks had an affect on us when they passed us. The problem is that the air that comes off the front of their truck hitting the side of the Windjammer.
Think of it as a lever. The air from the passing truck pushes the lever in one direction and the trailer tires act as the fulcrum. The result is that the other end of the lever, your tow vehicle, is pushed in the opposite direction. Unfortunately that into the lane of the passing truck... YIKES!!
The best way to avoid the problem, imho, is to keep an eye on the mirror and when a semi or other large truck are approaching your trailer, steer toward the right of your lane. This will lessen the impact of the air from the passing truck.
I've noticed that some truck drivers will actually move to the left of their lane when passing me. It makes a difference.
I never towed without the Equalizer but I'm sure it helped lessen the effect of the passing trucks due to the sway control of the device.
Steve & Lauren
2011 Windjammer 3065W
2012 Ram 3500, 6.7 Cummins