If you have camped in Trailers or RV’s long enough you have returned to your rig to the telltale beeping sound.
Or worse, had the beeping wake you up in the middle of the night. Tough to close your eyes to sleep after that.
Have you ever been camped next to someone that left their campsite for the day and their detector keeps going off on periodic intervals? The audible alarm is hard to ignore. Sometimes this is a Carbon Monoxide problem. Other times it may be low voltage.
If it is your rig, attend to it immediately. If it is a fellow campers rig make sure they aren’t in it unconscious, and/or notify a ranger or camp host immediately.