This was Chrysler's nuclear-powered tank
The Chrysler TV-8 was an ugly duckling that would've waddled its way across Cold War battlefields slaying everything in its path until it was killed or ran out of ammo. It was equipped with a nuclear-powered engine that could propel it from Paris to Moscow and back with enough fuel to stop in Odessa, Ukraine, along the way.
So, first, to address the fact that the TV-8 is the ugly elephant in the room. Yes, we know that even Bethesda would look at this design in a Fallout 76 pitch session and be like, "No, not ready for primetime. That's ridiculous." But Chrysler wasn't trying to create and field the world's most threatening tank in appearance. The company wanted to create one of the most threatening tanks in practice.
To that end, they traded heavily on the obvious strategic advantage of a nuclear tank: virtually unlimited range. Gasoline has a relatively low energy density at 46.4 megajoules per kilogram. Diesel is a little better at 48 MJ/Kg. The low enriched Uranium used in many reactors boasts a whopping 5,184,000 MJ/Kg.
That means that every pound of fuel a nuclear tank carried would provide 108,000 times as much energy as a pound of diesel fuel. A similar design, the R32, was expected to have a 4,000-mile range.
So, yeah, the prototype TV-8 had an extreme range just thanks to the fuel it carried. That greatly limited its logistics needs. Sure, it needed ammo delivered along with water and food for the crew, but that's it. No fuel trucks. No need for Patton to argue with Bradley about who got first dibs on petrol and diesel.
Chrysler wanted its prototype to survive nuclear bombs, so they packed everything in the teardrop-shaped, bulbous turret. The entire crew, the 90mm gun and its ammunition, and even the engine were up in the massive turret. The engine delivered electrical power to motors in the lightweight chassis underneath, that then propelled the 28-inch-wide tracks.
All of this equipment weighed only a total of 25 tons. For comparison, the M4 Sherman, a medium tank, weighed up to 42 tons, depending on the variant.
But the prototype had some serious drawbacks. First, it was actually powered by gasoline. It would get a nuclear vapor-cycle power plant if the design moved forward. But, more importantly, it was top heavy and provided little tactical improvement over conventional tanks. After all, most tanks aren't lost in combat because of range problems. They're killed by other tanks.
Of course, there's also another serious and obvious drawback to nuclear-powered tanks: The loss of one in combat could easily irradiate the battlefield that the U.S. hoped to hold after the battle. Nuclear ships sunk at sea are surprisingly well contained by the water. Nuclear reactors destroyed on the surface of the earth would have no such protection, threatening recovery and maintenance crews.
So, any battle where a TV-8 was lost would create a large hazard zone for the victorious troops, but the TV-8 didn't feature many improvements that would make it less likely to be killed in battle. It did feature a closed-circuit television to protect the crew from a nuclear flash, but that did nothing for anti-tank rounds, missiles, and RPGs.
In 1956, an Army review recommended the termination of the program and TV-8 never made it past that first, gas-powered prototype.
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