Sounds like we all have had our share of experiences. I was always aware of the noise my 1999 Cummins made as one time I apologized to a fellow camper who was sitting under his awning watching me hookup to leave. He said he deliberately came out to watch me because he loved the sound of my engine. Should have sold him
When we started with a popup years ago, we were staying in a state park. As you know, a popup is just a tent on wheels, so you hear everything outside. The loop we were in had sites that backed up to each other. Behind us were 3-4 boys/men(I'll say that loosely) who spent more time tuning their car radios than in their tent. This went on till at least 3:00am the 1st night. After a day trip, we came back to the popup later in the afternoon, the music was back on. I immediately went to the ranger's station and told him I listened to the noise last night but was not going to tonight. Well, he beat me back to campground and we didn't hear a peep out of them the 2nd night!
Lastly, we pulled into a casino rv park site(they are generally nice) just about the same time the next site to us was pulling in. I was greeted by a Great Dane as he stood there looking into my truck window. Oh brother! As we were setting up, we kept noticing something from them. They had not only 1 dog but 6! Ranging from the great dane, german shephard to a chihuahua. Then they bring out a baby play pen for the smaller dogs. Six dogs, 4 adults, 26ft trailer. We didn't hear a sound from them!!