Does your 19ft RV have a built in generator ?
That is the primary reason RVs have a CO detector
MORE likely to get CO from generator exhaust than from the LP burning applances,
The pre tell (tale tell) I my 97 Bounder will sound off and shut off the LP, if I leave the 460 engine idling too long while parked, or if I leave the entry door open while warming the engine for an oil change etc..
The CO detector mounted on the wall in the bedroom will go off if the somebody else is running a generator and I have an open window, it's bad and needs replacement,
I tried a brick house one from home depot, but it was a pain, it only worked when 110v was on, shore or generator, it would alarm when powered up, then chirp chirp as a working indicator, the only 12v CO models are marine or RV, $$ have Not found a nice battery operated quiet one, to hang on the bedroom wall
