We've always slept with one of those 'white noise' machines/apps, highly recommend one...at home, in lots of hotels throughout the year and camping initially in our Roo '19 Hybrid and now 233S. Heck, you can even opt for bird/ocean/fan noise if that's your preference, and of course you can adjust the volume.
Our family of six, including four young children, has never had a problem with any disruptive noises outside our hybrid camper, whether at a lightly crowded State Park or a jam-packed Jellystone Park. We like the 'Simply Noise' ipad/iphone app, free and easy.
With all this said, I realize that the idea of making noise might be offensive to the real campers out there, so apologies if so. 7thson