The Landkreuzer in reality never made it off the drawing board because of it's sheer size. 1500 tons was nearly impossible. It was for sheer propaganda.
Some major difficulties in development:
1. The Panzer VIII Maus was already destroying roads as it was. The Landkreuzer 1000 was nearly 25x Larger. I can't even imagine the 1500.
The destruction of roads and bridges would have made the Landkreuzer just an obstacle.
(See picture A)
2. The tank would be so large that all Allied aircraft could practically say to each other, "Holy Moly, a giant metal 800mm CANNON??!?!?! EVERYONE BOMB IT."
The sheer size of the tank would make it an easy target.
3. The tank was too large to transport by train or by ship. Making it impossible to transport would be even more of a problem than getting it to MOVE.
4. The materials required for such a tank were humongous. The armor was planned to be 250mm on all sides. The main cannon was to shoot a 800mm shot that traveled 23 miles. (See picture B) PLUS two 150 mm sFH 18/1 L/30 howitzers and a mass of MGs all over.
To top the sundae with a cherry, it was to be engined with 4 Dual U-Boat engines. (Gas Guzzlers!)
Picture A-Landkreuzer 1000 "Ratte"
Picture B-The shot to be fired
Picture C-The plan of the Landkreuzer 1500 in comparison to:Panzer VIII Maus, a truck(Of some sort, not 100% positive what that is), and a Person.
Picture D-A final sketch of the 1000 Ratte. It was never developed.
Even if the tank was developed, it would be too large for COH. Imagine 800x a Tiger. There is the 1500 Monster.