It doesn't matter what you call the vehicle. It only matters what the parent blank nodes are called, and the collider as well. The collider should be a low-poly shape somewhat engulfing your model. Wheel and seat mounts are bones/armatures.
Collider = Col
Mesh(es) = Whatever
Shape, Col0, and detail32 are all empty nodes.
Seat(s) = mount0 (Driver), mount1, mount2, etc...
Wheels = hub0, hub1 (steered wheels), hub2, hub3, etc...
Then, parent as such:
Col0 < Collider
Shape <
detail32 < Mesh & Bones/Armatures
