In article , scorrea-removethis-
@socket.net says...
Besides that, tires usually are reactive to forces, not force generators.
In order for an oscillation to be established, the tires must be excited by
something. A high hitch raises a trailer CG

It's hard to see how this can be, since the CG is so close to the
trailer wheels. Raising the hitch 6" would raise the trailer CG less
than 1".

ans contributes mightily to
swaying back and forth.

The explanation that seems more likely to me is the higher hitch lets
the trailer roll the tow vehicle more, which would introduce steering
forces.

Chris also said:

"Other advice that helped included lowering the hitch position and
shortening the hitch to reduce the distance from the ball to the rear
axle."

It sounds like he tested the hitch effect separately from the tire
changes.

Stiffer tires would be more difficult to excite,
but
they are masking the force, not curing its existance.


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Eric Greenwell
Richland, WA (USA)