Precision is a truck designed for downhill or slalom competition with a mechanical connection between the baseplate and hanger rendering precise steering between the deck and axel.
Any bushing suspended hanger would not be precision. No matter what material it is made from. Ollin used Ronnin precision cast. I think Next Boards used a precision Bear truck Those would be the only examples I can come up with.
Channels with their tall rake are inherently unstable at speed. I would bet if someone made a zero or negative rake channel it you could make a decent speed with it.
With that, there are non precision trucks that are very good.
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