Sway is easily controlled by properly loading your trailer and using trailer brakes
, assuming you have a brake controller. You should have at least 10% of the trailer weigh on the tongue and as little weight
behind the axle
as possible. If sway does occur, use your brake controller to manually activate the trailer brakes
. This will stop the swaying quite quickly.
I have a theory about trailer sway. I sell instrumentation. One of the products I sell is called a vortex flow meter. It detects flow by detecting alternating vortices that are shed off a bluff body in the flow stream. This causes an alternating force, from side to side that is directly proportional to flow velocity. Google “karman vortex street” and you will see what I mean.
My theory is that the front of the trailer acts as the bluff body and sets up the initial oscillations. This is amplified by the speed of the trailer and poor loading.
When I was younger and stupider, I loaded a Trillium
4500 very wrong, (see picture). I had a hitch receiver on the back and picked up some parts mid travel. When we got on the road I felt the trailer pulling up on the hitch. Not good. I stopped at a closed truck weigh scale and sure enough, I had about 20lbs of weight
on the tongue. But no sway, even though I had the worst possible trailer load. Why? My conclusion is that the van I was driving prevented air flow from impacting the front of the trailer and when it did swing out of line with the van. The air flow down the side pushed the trailer back into the wind shadow of the van. That’s my story and I’m sticking to it.