Swampy, I no truck polisher. I did notice an operation in Casa Grande, Az where they polished trucks. They put the wheel on typically a 7/9" angle grinder/polisher/sander-and used the edeg of the wheel.
In the photos section, I see a KW truck wheel polished-the buffs are still in the picture. There are some methods where a special face pad is used, mainly to shine Airstream trailers and Aircraft. These surfaces are typically smoother than those on a truck-there is even an orbital cyclo or something polisher for fine finishing. Looks like carving a tunnel to me, especially the planes-painted a Beech Bonanza yrs ago-that is a lot of sanding-don't wnat to think how much polishing a plane would take.
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Looks like you use the same techniques as buffing parts, you just use a portable electric angle grinder instead of a stationary bench buffer motor.
Hope this helps some.
James