Remember that million year old thread about the AT-ATs dropping off troops? 
I'm just going by lore here, and if that's not possible, fine, but I managed to find something on this.
In the wiki article, (http://starwars.wikia.com/wiki/All_Terr … _Transport) it states two ways that the AT-AT can deploy troops.
"Positioned in the center of the body section was a rectangular boarding hatch with sliding ramps where the AT-AT's complement of troops loaded and disembarked. An AT-AT unloaded its troops by kneeling to three meters above ground level until the boarding ramp could extend outward. Individual stormtroopers could also be deployed rapidly by rappelling cable."
Curses, foiled again!
