I have no idea what's going on in this ad. It looks like a combine, a tractor, and a field of green wheat. And it doesn't really look like the combine is doing anything. They're just driving around on the field.
The concept behind the ad isn't bad. I'm guessing that NAPA just wanted to raise awareness that you could buy combine and tractor parts at their stores. They were even probably trying to get in multiple pieces of machinery to really illustrate the point.
The actual ad, though, just falls apart. The machines are running through crop that's not ready to harvest, which would cause lots of damage. Most farmers I know go to considerable lengths NOT to do that.
Just another example of not knowing your audience before building an ad.