If it is like taxes then what are the things being taxed? Might it not be easier to just edit the Chinook's AI module to increase the cash bonus with supply line upgrade? The you will get more case per docking at supply center.
If you want the supply center itself to generate cash then you can use the oil derrick/ black market method but that cannot be turned on by an upgrade, it is always on.
If you want it to be turned on by an upgrade then you have to make a new object that generates cash using the black market method, give the supply center a garrison contain module to contain it (best limit it using allow inside kindof to only allow that object, so give that object an unusual kindof like LOW_OVERLAPPABLE so that you can't garrison other things in the supply center), and then have the upgrade OCL the new object inside the supply center in the manner of the overlord upgrades.
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