ground dynamic

Hello everyone I am a young enthusiast who wanted to make a video game simulator very simple but I can not do dynamic terrain. I kindly ask you to help me even with just a few clips just to see a little logic. hello and thanks for your support. (translated by google translated, i came from italy)

What do you mean by Dynamic Terrain?

the Dynamic Terrain for me is the dynamic shaping the ground according to the weight of the machines in the game. this is an example. (The photo is taken from the game spintires)