Measuring CG height
 

What is the best method for measuring the vertical position of CG?
The only reasonable way I can think of is putting the car on a slope and seeing what inclination will it start to flip over.

Research RC Crew Chief, you can enter your car into a program or watch the videos and see how they figure the CG and you figure it on paper. I believe you can get pretty close. But the cost of the software is well worth its price and the setup you can learn from it.