@GeneralHandGrenade:
More ideas would be greatly appreciated.
I don’t know if historical accuracy or even technical plausibility are factors that you’re considering – but in case they are, here are a few comments.
A few genuine heavy tanks like the IS-2 and the Tiger did see combat in WWII, but this was not the case for super-heavy tanks (like the Maus) and even less the case for “land-battleships” like the Landkreuzer P. 1500. The closest the Maus ever came to operating was the single unit that was fully aseembled (meaning chassis + turret) at the provings grounds where it was being tested. The 188-tonne Maus was pretty much at the extreme limit of what was physically achievable in terms of tank size with WWII technology, and even then the results were hardly worth the effort. The thing could barely crawl on its own, it was too heavy to cross bridges, and shipping it by rail would have been a severe challenge because of its width and weight; finding rail lines with the required width clearances and weight capacities would have required taking circuitous routes to get near the zone of combat operations. Moreover, as I mentioned in another thread, the Maus would have been relatively easy for the Allies to knock out of action by a form of attack against which its armour offered no protection: napalm bombs delivered by ground-attack aircraft.
All of these problems with the Maus would have been even more severe for the Landkreuzer P. 1500, which unlike the Maus was probably not even an achievable design from a physical standpoint, let alone as a weapon with any practical battlefield value. And remember that, as a general rule of thumb, the heavier a tank becomes the more maintenance it requires and the shorter the distance it can travel on average before breaking down because of the strain on its treads, suspension and transmission components.
Note that even though tank technology improved after WWII, very few super-heavy tanks were ever built; most, I think, were designed in the decade or so after the war, mostly as test vehicles. Even conventional heavy tanks were ultimately abandoned when the more practical concept of the balanced-design Main Battle Tank emerged and became technologically feasible. Super-heavy tanks and land battleships have only ever flourished in sci-fi stories like Keith Laumer’s Bolo series and in games like the Ogre series; they’re simply too impractical for real-world use.