TankChair: Tank Chair is a Custom off-road wheelchair that can go anywhere outdoors. Conquers Streams, Mud, Snow, Sand, and Gravel, allowing you to get back to nature, and can also climb up and down stairs.Tank Chair is a Custom off-road wheelchair that can go anywhere outdoors. Conquers Streams, Mud, Snow, Sand, and Gravel, allowing you to get back to nature, and can also climb up and down stairs.