Good point. Very few fires to extinguish once all of the buildings are burned and/or bulldozed to the ground.
There was a house in Harlem that needed an extra engine. They parked it on the street and built a chain-link cage around it.
Again, can’t find an image, sorry.
Here’s a video of an engine in a cage...but for a different reason
http://www.youtube.com/watch?v=-kXiivOh6hU