VehicleWheel collision mesh not working as expected


No matter what mesh I change the ‘collision mesh’ to in a VehicleWheel class, the vehicle still acts like it’s on a perfectly round wheel.
Is this behavior intended, or has anyone used custom wheel collision?

In the screen below you can see a mesh where the wheels have been set to a cube in the PHaT and in the VehicleWheel, yet the vehicle moves without any issue as if on an ordinary round wheel.