I assumed a tail dragger for after the main wheels went over the trench.
Should have some awesome nastiness on the bottom for hanging over the trench.
It might have a trap door underneath so a machine gunner could spray the trench it crossed
It’s been a while since I first read about the czar tank but the thing was underpowered and prone to breaking down. Got stuck in a marsh and there it stayed. Evidently somebody pulled it out and put it on display.