These 'tanks' are indicative of how brazen Mexican cartels have become over the past decade - it shows how the profits gained from seizing a rival's territory by force is a higher priority than concerns about how the government would respond.

Here's a video of what Mexican cartels typically roll around in: new, often uparmored Ford and GM pickups and SUVs filled with gunmen and even mounted weapons.

http://www.youtube.com/watch?v=VhxSIqopHbU