On Monday, December 23, 2019 at 12:42:14 AM UTC-5, wrote:
Check out this technical paper (https://purehost.bath.ac.uk/ws/porta...2/JAUTO981.pdf)

This paper uses a model trailer with negligible aerodynamic characteristics.
Caravans have enormous side areas, glider trailers usually less but with rear fins.
So this paper is missing a rather important contributor to sway, which is the
aero force accelerating the trailer back to center.

Some glider owners have had good results reducing sway by fitting spoilers
on the fin.

Be careful out there,
Best Regards, Dave