When coming up with the design for this tank I started by imagining what sort of functionality a near future tank would need to be effective in patrolling the dunes of Arrakis. First of all it would need to float, it would need to be fast and highly maneuverable but I also wanted it to have a big cannon. So I based the design, following the bio mimetic universe of Dune, on an Isopod. Where the tail and the propulsion engines would provide all these functionality needs, including the traction to counterweight the cannon shooting.
You can just imagine the tail in a serpentine movement floating above the spice filled dunes.