I don't know if you are going to believe me, but right there, in that motorhome, in the middle of nothing, close to a beautiful lake, it runs a full Lightning node with my own bank (lnbits). And works beautifully. So well, that I already have several users. And it consumes only 10kb/s of data, and around 5W of energy, more than enough to be supported by my solar panels installed on the roof, and my dirty cheap 4G connection.

Soon I will write a guide on how you can have your own mobile bitcoin bank, with its headquarters completely undefined!