"They actually dropped the tank from the looks of the picture and took the fuel pumps."
If that's the case, I'd bet that:
1. They knew the car, and what was in it.
2. They are familiar w/ these kinds of builds, and knew exactly where to look.
3. With that extensive a strip, they had a place that provided considerable comfort and cover...
I'm betting they had followed you to the restaurant, then you ran them off, and they followed you home, then to work.
Could even be someone you work with......
Just like a homicide investigation: Start at the inner circle, and work your way outward...