Suspension arm length
How can I determine optimum suspension arm length (for on road cars)? Is it as long as possible? Or is there an optimum between too long and too short? I know with shorter arms as the suspension compresses, the wheel increases in camber, track width decreases, and the effect is less so with longer arms, but I'm not sure what's the 'best,' what are the drawbacks/advantages of different configurations, and how to find a good compromise. Any insight would be appreciated.