Can multiple Harvesters have multiple unloaders working?

[mountainboomer]

If I have a very large field and I am using 3 harvesters, can one unloader handle all three or can you run more than one unloader. I don't see a way to pair up an unloader with a harvester. If there are 3 unloaders on the field how is it determined which one responds?

[Tensuko]

Just add more unloaders and they will figure out wich unloader goes to wich harvester.