General question about marx generators

Assuming it's a tripler, and it's full wave, you'd need 6 capacitors.

Lets say the input is 100Vac, so the output would be 300Vac

My question is:
For those capacitors, would they all need to be rated to 300V? or just the last one? Or for that matter, would three 100V caps work?

(I know it isn't best to work @ max voltage, but for the sake of trying to figure this out...that's what I'm using in the example)

Cockcroft-Walton or cascade multipliers need the capacitors to be rated twice the input voltage. No matter how many stages you add double is all you need. (same with the diodes.)

Thanks!

Thank you very much,
I've been trying to figure this out for a while now, and knowing their actual name will prove helpful also,
thx again.