Your body damage is how much damage you cause on enemy tank when your tanks are overlapping each other.
If you have a high body damage, you will be able to destroy enemy tanks without shooting bullets, just by keeping your tank colliding with enemy tank.
So, it's important to have a body damage higher than enemy body damage, to avoid being killed by super fast tanks.
Thank you very much for your feedback and ideas. Very good ideas, I will use in the next game update.