From ChatGPT:
The Ohio-class submarines are equipped with two S8G nuclear reactors, which each have a thermal power output of about 190 megawatts. Each reactor is housed in its own compartment and is approximately 42 feet in length and 29 feet in diameter. The Ohio-class submarines are the largest submarines ever built for the U.S. Navy, and their reactors are among the most powerful nuclear reactors used in any submarine.
Doesn’t sound like even a miniaturized version of that will fit inside a large SUV, to say nothing about the costs or risks of traffic accidents turning into a hazmat situations.
I have (yet another) dumb question
The engines on an Areleigh Burke class destroyer generate 78,000 kW but the Ohio class reactors produce 190 mega watts.
Why the huge difference?
My point is, a nuclear Ohio-class submarine puts out about 380 megawatts of power in a relatively small footprint that doesn’t take decades to build especially if you took out all the electronic warfare sections and used it just for power generation to the electric grid.