A Tartaran Tank!
The 'balls' are driven by air jets and support hydralic 'legs.' Because of the balls, the tank can move quite swiftly, move sidewards and make much sharper turns. Due to the hydralics, the legs move up and down in conjunction with the terrain, letting it move over rough terrain much more smoothy.
The cannon is a recoil operated auto-cannon that fires delepted uranium shells with fanastic firing speed, and can be manually aimed or aimed using the electronic tracking system.
The Conqueror is a 26 ton war machine worthy of it's deadly reputation.
Edit: Inspired by [link]
Flying Debris rocks. And I hope to be able change the design enough soon.