Well, I found already thread on a different forum. Do not know if sharing is okay, so won't post it That's how they call "smart" toilets in Japan, there's an article about them on Wikipedia
https://en.wikipedia.org/wiki/Toilets_in_Japan
They are expensive, I was choosing a toilet and found
this list, and there's Toto Neorest on the top, so I wanted to ask someone if anyone installed this in his RV