On the oil trucks.
Yes, obviously the US could have started bombing those any time they wanted. It's not exactly hard to find tanker trucks that hang around oil fields. The semi-official reason (from unnamed military sources) why they haven't done this before is because those trucks are operated by civilians, not ISIS, and they're kind of an important part of the infrastructure in the Middle-East.
After the Paris attacks however US has clearly re-evaluated that policy.
http://uk.businessinsider.com/us-isis-oil-trucks-2015-11?r=US&IR=T
Quote:
On Monday, US planes destroyed an estimated 280 ISIS oil trucks near the border between Syria and Iraq, NBC reported, citing unnamed US officials. The strike was carried out by A-10 Warthogs and AC-130 Specter Gunships.
In a statement, the US-led coalition said that near the cities of Al-Hasakah and Deir ez-Zor, one attack destroyed 283 ISIS vehicles.
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The US
actually dropped leaflets to warn the truck drivers before they dropped the bombs. So it might really be that they actually cared.