As an alternative, if you or your animators find motion paths too
restrictive, consider projecting a rectangular, 4-vertex plane onto the
ground, and have each wheel follow each vertex. The projection would handle
keeping wheels on the ground, and the animator would no longer be
restricted to the motion path. Projection can happen via e.g.
TransferAttributes, ShrinkWrap or the Python/API.
It's more complex in that you'll also need something to keep wheels from
"strafing" - that is, moving sideways - but as I said, is an alternative to
motion paths if motion paths is ever a problem.
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