First off a 4 wheel trailer has a second pivot point, think of a childs wagon
and it will become obvious.  Secondly the hitch and axle are the only places
free to pivot normally, center of gravity shouldn't matter unless there is a
crash.
If you are turning a simple curve with the tractor, the trailer axle should
follow
a curve with a radius bigger than the tractors turning radius by the distance
from the hitch to the trailers axle. So if the tractor turns with radius R1, and
D is
the distance from hitch to trailer axle, the axle should travel a curve with
radius
R2 = R1 + D

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Tim Attwood

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