For the Matrix III testers, here is setup info.
Disassemble the truck and replace preload pins with kit pins and set to flush with the preload plate.
Reposition stock bushing guards:
Insert bushing between bushing guards:
Reassemble truck holding the preload plate in place to prevent dropping out and preload once truck is assembled, you can visually see if the preload is even by looking at the plate position:
To disassemble, back out the preload pins to relieve pressure on the kingpin.
4 shapes sent smallest is A to largest D.
Set the board up with a smaller in front than the rear so you have 6 combinations to experiment with: AB, AC, AD, BC, BD, CD