I'm creating a very simple custom wheel and trying to get it to work.I recorded a 3 min video going over the details you can see, but here they are in text. - The truck body has a rigid body. On that are child wheel objects. - The wheel objects have no phyics, but just ask a child rotor object (also empty of physics) to transform.rotate. - The rotor has several child cubes, at intervals around it. So when the rotor spins, it causes the cubes to rotate around the rotor. - When running over a physical model with a jagged surface, the cubes cause it to pull itself across. - When it sits on a flat surface, it goes nowhere. - Each collider (wheel and ground) have physical materials attached, with friction. But still the same results. I'm wondering if there is an easy way to set this up, or if I need to work out the math to make the tire physics work. Any advice would be appreciated. - Thanks.