Check smoke detectors. Most RV's use commercial household smoke detectors and when the batteries get low they beep to let you know. As most people are not in their RV ( Unless full timers) every day as they are in their home, it is a good idea to replace smoke detector batteries at the beginning of each camping season. You could also get one of the new 10yr units.
2015 Freedom Express 248RBS
TV 2015 Silverado HD2500 Duramax
TST Tire Monitors
Honda 2000I + Companion
2 65W solar panels