[VAC] Re: Correct Measurement of Tongue/Hitch Weight

["Dr. Gerald N. Johnson, electrical engineer" <geraldj@xxxxxxxxxx>]

You improve the precision of the tongue weight measurement by minimizing
the length of the contact at the supports, that is along the length of
the plank. A knife edge is the best, but does tend to cut off the plank.
Round pipe is next best and the distance measurements are from the
centers of the supporting pipes. A brick and a scale alone are poor
because the support point of the plank is indistinct by the width of the
brick and the width of the scale. Similarly the width of the post makes
that point indistinct, unpredictable, and unrepeatable. Its important
that the supports (knife or pipe) be precisely perpendicular to the
length of the plank for the best precision.

Gerald J.