Trouble is you got to hold the wheel and reach for the lever. Could be you need both hands on the wheel. I recommend ease off enough on the throttle to begin losing speed and holding the wheel in a fixed position. Easier if going straight on a straight road. But you can hold in a curve and make very small adjustments to stay. The biggest issue is trying to compensate or steer out of the sway. It is unnatural motion that cannot be compensated. If the vehicle can remain straight the natural friction will begin to reduce sway.
I had read this and have used it. Was getting pushed out of my lane and this brought me back into control a few times.
Yes give the trailer brake a manual squeeze if you can spare a hand off the wheel. Or have your co-pilot trained to apply gently on command.
