Measure weight distribution and balance

Hi everyone! My name is Jonathan and I have started learning and using sketchup to design a rocking horse toy. Since it need to have the rocking movement that swing back and forth, I was wondering if there’s a way (or an extention) that can help me measure the weight distribution or balance of the design.

If not, anyone has any suggestion what other software that can do so?

Thank you guys so much!

You might try Alex Schreyer’s extension:

Maybe TIGs Center of Gravity can help you.