What is the process of sizing and positioning secondary pivots

[Kiri Robbie]

With the static loading (first) discussion, you mentioned a secondary pivot point of timber/rubber can be used if a suitable pivot point cannot be achieved. In this case, what is the process (if any) of sizing and positioning these secondary pivots?

[Stuart Edwards]

This is done geometrically relative to the size of the load and location of the centre of gravity.  For example, as the load is tailed, determine the point at which the CoG would go past the tipping point and become unstable.  The new pivot point should be sized that it is engaged prior to the tipping point.