With Vehicle ammo you do simply tell the Supply Truck to examine the tank, (DO NOT tell the TANK to examine the TRUCK, the tank often RAMS the truck on inspection and kills it. The Truck will, at most, get stuck for a few seconds). You would then have to find the proper ammo for the Calliope, im assuming your rockets ran out? YOu then would have to find the rockets in the supply truck and just move them over like you would with infantry.
Refueling however is a different story. You must get an infantry man to get a Fuel Barrel of a Fuel Can, Barrel holds 200 fuel, Can holds like 60 fuel. If it isnt filled up in MP by default you then would have to find a wrecked tank or something to fill it up. You do this by giving your soldier a barrel, have him carry it to the tank/vehicle and with your barrel selected your icon over the wrecked vehicle should turn into a ring with an oil droplet in the center, this is the "siphon" icon. You then click the vehicle and your dude will walk up and siphon the gas out. You then take that barrel back to your empty tank and the icon should now be a "funnel" icon, you then click your tank and the soldier should fill it up. This is best done if the vehicles are close together otherwise its a VERY slow task...the soldier moves at snail speed carrying the barrel.
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