Re: A-arm lengths and mounting points help
6* is a very common number, but if you look through a lot of the trophy trucks and Class 1's you will see that 12-14* is just as common (I know it isn't exactly kingpin inclination. . .but most desert racers/fabricators that I have been around and talked to refer to that angle as KPI regardless of whether they're using king pins or other).
My suggestion would be to stay somewhere between 6-12* of KPI as rough upper and lower boundaries.
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