This is my At-At, This is my Gun.Ah, Star Wars hardware. Those big, tall, dinosaur-looking tanks from the Empire Strikes Back always fascinated me. But I could never get my head around them as weapons. They seemed designed as enormous, expensive and impractical behemoths. (I'm surprised the Untied Stated hasn't developed one for fighting ISIS.) Joe Pappalardo also ponders the military flaws in the Empire's weaponry. For instance, regarding the above mentioned dino tank, officially known as an At-At:
". . . they are not well suited for front-line action. Scaling up a 4-legged design to mammoth AT-AT walkers brings few advantages, and numerous disadvantages. Sure, the AT-AT could step over many obstructions, like trees and boulders. But steeper inclines and the inability to roll upright—its awfully boxy for such a maneuver; a barrel shape would help—makes this a dangerous ride."
Some guy with heart and a FGM-48 Javelin could knock one out. The Riders of Stinking Rohan could topple these big boys. There's more on SW military tech in Pappalardo's Popular Mechanics piece. If it were possible to speak with Emperor Palpatine, I'd have to say: Keep it simple and buy Russian, dog.