remember you came to an RV forum where members are campers and travelers
NOT 'members in a rock band'
many people here camp in forest campgrounds National parks etc..
there is no electric power no hookups, and they do use generators as needed and they want them quieter making less noise, less disturbing
you ask for advice, you didn't like the advice, maybe there is a band bus forum
where they are more attune to your way of thinking
enjoy your rv/band bus, i'm sure you will not notice the noise while rolling down the road
there are people here with champion generators
but they sound different when sitting on grass in the open. than stuffed into a RV compartment reflecting all the sound like an amphitheater