Is there a reasonable way to have a 6u suitcase frame work with both 230 and 115 volts IE, I want to be able to play it in Europe and the States.

From checking the previous discussions, I understand that a switching power supply has been tested and proven problematic. But is there an actual solution Could two separate power supply units be installed in the suitcase, for example Or an external power supply One installed for 230V and another external

I am based in Europe, so most of the time I'll need 230V.
Step up transformers tend to be not very portable...

Vesa