Keep in mind that in Desert Storm there were hundreds of AAA batteries, dozens of SAM batteries, etc. The way we play DCS A-10C is very different from real life.
In the sim, we make multiple passes on a single unit of tanks, etc. In real life, a 4 ship goes out with 6 MK-82's, drops all 6 from high altitude to avoid the threats, and RTB as fast as they can.
And yes, the targets being attacked were indeed tanks and other vehicles. Read a few books about A-10 operations in Desert Storm and you'll understand what I am saying.