Share 'Size up from the backseat'

"Engine 7 is on sence, Alpha side of a two story single familiy dwelling, fire from second floor, E7 is taking fire attack, next in engine take command, E7 has our own water supply" So that is what we as Firefighters in the backseat may hear from the officer, but what about "our" size up from the backseat? As a firefighter, weather it be engine or truck, what is going though your mind for a size…