The Mammoth Tank was the iconic weapon of the Command & Conquer series. Now, in game it was just a stupid-big tank.
It has two 120mm cannons. Why would a tank need two? Either targeting two enemies for the opening barrage, or have it work like it's own artillery battery.
The Mammoth Tank also uses a nuclear power plant. I did the math, and a typical naval reactor would take up 1/3 of the internal space, but LFTR reactors could be MUCH smaller.
Now, when thinking about the Mammoth Tank, the first thought among many is the simple impracticality of the Ratte. Well, the Ratte has battleship cannons, which were legitimately overkill for battleships, nevermind tanks. The Mammoth Tank instead has two 120mm cannons.
The Ratte also could not ford rivers, nevermind bridge, had ridiculous fuel requirements, and was so big that even with dozens of AA guns, it was still vulnerable to air power.
But, the Mammoth Tank is nuclear, meaning it's range is unlimited. It could also carry enough personnel and supplies to make it completely self-sustaining for the long term. It could even act as a mobile base. It would probably be closer to the Maus in terms of weight.
See, while the Ratte was going to be used in Europe, we are Canada. We have vast tracts of open land that right now are being patrolled by natives in orange jumpsuits, because without the Arrow, we don't even have air power suitable to the job.
Now, I', not going to in any way insult the Canadian Rangers, as they are insanely capable. What I am saying is create a regular unit of them and give the Mammoth Tanks.