Lots of interesting points in this thread.
We have only camped in one NP so far. When 8AM came around, generators fired up all across the CG. So I am surprised that they singled out the OP's. Was yours the only one running in a big vicinity?
Some people run their gensets every minute of every allowed hour, and I'm not talking about hot weather and AC needs. I don't know why they do it, but they do. If that was the case, I can see a ranger cracking down. As a fellow camper, I dislike those people. I have no issue with people who run it as needed, but leaving it on the whole time is pretty darn annoying. Gensets are annoying to begin with; I run ours as little as possible if the noise is going to carry.
I've seen references to people clamping a SuperTrapp muffler on, at the CG. DaHose, can you give specifics of what you've done?
I think Winnebago's location on the curb side is dumb. Period. That doesn't change the sound around the CG, but does put the fumes and sound right into the campsite space.
I am really interested in the inverter gen installs. I'll have to log onto the yahoo group and read up on them.