

They have a high center of gravity and can be easily tripped, which was exploited in the Battle of Hoth.They have footpads in place of treads, which greatly increase their ground pressure, and which will cause them to easily sink as compared to treads.However, AT-AT walkers have a number of (rather lethal) drawbacks and no advantages that I can see compared to tanks. (No combined arms tactics were used in the Battle of Hoth, but that's a different question altogether)

AT-AT walkers are used by the Empire in a manner that is tactically identical to how a modern day army would use a tank, in that they are used as shock armour with powerful main guns which will punch through entrenched positions.
