On Friday, June 6, 2014 6:44:32 PM UTC-4, son_of_flubber wrote:
My Avionic trailer has leaf springs and no shocks and the rhythmic ass end sway that develops at higher speeds encourages me to keep the top speed at 60-65 mph. That speed is just fine with me except when interstate traffic if flying by at 80 mph. In that case I feel that I'm something of a hazard, especially if I'm trying to merge or change lanes.



I'm thinking that shocks might dampen out the rhythmic sway that seems to be self-reinforcing. Tow vehicle is 2004 Volvo XC70. Single seat glass glider.

If you see rolling associated with the motion,damping might help. I doubt that to be the case.
This topic has come up several times.
Easy improvements a
Get any weight you can out of the back of the trailer.
Check your tires to see that they are properly inflated. Stiffer side walls that result from somewhat higher pressure sometimes helps.
One guy I know put "trip strips" on the leading edge of the dog house on his Avionic trailer and claimed it made a big difference. Color me skeptical but it may work.
UH