LogFAQs > #962029716

There are a couple potential advantages. A bipedal tank would stand taller than a wheeled or tracked vehicle, allowing a higher gun platform. This, of course, also has the tradeoff of being a better target.

A bipedal tank could crouch behind cover and pop up to fire its weapons, then crouch down again, like a mobile disappearing gun.

Of course, in the face of air superiority all tanks, wheeled, tracked, or legged, are pretty much sitting ducks.