It occurred to me what causes the trailer sway cycle - The tail of the
trailer sways to the right , the trailer becomes a lever with the trailer
tires as the fulcrum - The hitch is pushed to the left - The truck becomes
another lever with the rear tires as the fulcrum , the front is pushed right
and the caster in the front axel makes it steer slightly that way (opposite of
what would stop the cycle) - If the trailer CG is more foreword it's tires act
less like a fulcrum and if the truck has a fifth wheel hitch it no longer is a
lever and the front steering sees no side load - I CLEARLY remember my trailer
using up 3 lanes of the Pennsylvania turnpike while the 18 wheeler I had just
passed scrambled to get out of the way .
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