Agree, corner weight scales are the easiest way to find the plan position of the CoG.
If you want to do something more interesting... find the CoG as accurately as you can with the car horizontal, then jack one end as high in the air as the body allows and corner weight again. You will find that the CoG has moved proportionally closer to the lower end of the car than if it was a completely flat object. The two measurements can be used with a bit of scale drawing or trigonometry to find the height of the CoG.
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