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You really need to look at your particular setup as far as the detectors go. I have a 2018 Cougar 22RBS trailer and the smoke detector and CO detector are both powered by their own 9 volt battery. The propane leak detector is powered by the 12 volt system and it does get disconnected by my battery disconnect switch.
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2018 Keystone Cougar 22RBS
2020 Ford F-350 XLT SC SRW 6.7l Powerstroke.
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