The name of the joint does not matter for animation. To make a material colorable, name it
blank for the color you want to paint it and
black50 for the darker version of the color you painted it. For levels of darkness in between, choose
black25 or
black50.
Now, you need a collision mesh named
collision-1 and nothing else. It must be
convex. For the groups on the vehicle, I have not figured out the LOD's yet. But you CAN name them anything as long as the last character is a letter followed by 0. Now, the problem with this is your shadow will be the shape of your collision mesh. In order to fix this you have to toy around with the LOD's.