down home wrote:
Notice that the new coaches are near impossible to hear the generators,
I have only a Winnebago built 2005 non-slide Class C with a built-in Onan gas generator, and yeah ... of course one can hear it's cooling air sound and a low hum from the outside and hear a low vibration-less hum inside ... but it's not a big deal to us when sitting inside of the coach or outside of it. I attribute this to the facts that it's mounted under a well-padded interior floor and is mounted up high enough in it's cabinet such that none of it's case portrudes down low enough to be seen from the outside. I could quiet it even more by lining it's cabinet with sound proofing material and by placing a rug under it whenever we park it on an asphalt campsite surface. I also use an E3 spark plug in it to reduce fuel consumption and reduce noise.
However, I once stood beside a Class A motorhome with it's generator running in order to try and hear it's whisper-quiet low humming sound that could not be heard at the next campsite. It probably was an 1800 RPM water cooled diesel unit buried somewhere deep inside it's frame. So it IS POSSIBLE to have and run an RV generator that just might meet Sound Police Criteria.
Regarding built-in gas generator noise, we lucked out when we bought our rig new. Knowing what I know now, I would not buy an RV with a generator so loud that it couldn't be tolerated inside and outside when run for hours in the middle of the day for air conditioning. Self-contained RV's cost too much to buy one with a noise-unusable built-in generator.