This is part of the main Story and can't be missed. This is the next mission after preparing the camp for team bravo. It isn't that hard if you hit something or kill some zombies. but be careful with explosions and gunfire as these are blowing up the armadillo very easy. also don't try to go the direct route north, as it is blocked. you have to use the bridge to the south east part of the map and then north onto the freeway.