kknowlton wrote:
A very untechnical answer: there is sway and there is "wind wag," which is a different phenomenon. Sway, I think you would feel in the vehicle, as we have had wind wag and do feel that (in a lighter truck than yours). You did say it was a very windy day, and it would be pretty much impossible to avoid wind wag on that kind of day.
OP, read this ^^^^and then read it again. GREAT answer to your question and on the money.
Once "true" sway starts it's hard to get under control.
This is true sway. Another true sway video.Notice it starts small and get bigger and BIGGER. Much like a wave in the ocean. Unlike a gust of wind which will just push you around a bit and then your trailer will snap back towing straight again.
Fortunately most people will never experience this. Unfortunately a lot of new trailers coming out of the factory are getting lighter on the tongue so SUV's can tow them. This is a really bad thing!