I don't know what you need to do to accomplish this... but I'd consider looking at the humvee locomoter to learn how to make supply trucks move backwards... and then look at the way point system on the war factory repair (I'm not sure where in the code it is, but it's when you order a damaged vehicle ot be repaired by the war factory) to learn how to code the truck to perform a few specific way points on it's way to the final destination.
Again, I don't know the answer to your question, but with a sinificant amount of research and testing on your part, I think you can learn exactly what it you need to know, based off of the observations I gave you... or someone else can answer :-p
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