Pick your supply truck... press X, move the eye over your cannon/mortar and the truck will move to your mortar, and when within reach, the inventory of both units will be shown, and with one right click, you can then move all the appropiate ammo from the supply truck to your mortar.
Be careful though when doing it (I prefer direct control when doing this) since the truck quite often kills the mortar in the process... no problem with cannons/tanks though.
~Zeke.
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