X2 on the LP/CO monitor. They are hard wired to the battery and the only way to not drain it is to take off one of the battery wires or add a shut off. I like the simple one for 9$ that has a simple screw in connector. Easier than taking the wires off each time and simple to install.
Alternative is to get in the habit of keeping your camper plugged in, adding a trickle charger like the Battery Tender JR. or solar. Kill the battery a few times and there will be little life left in it.
2017 SLX 195RB
2014 Jeep Grand Cherokee Overland, gas 3.6 V6
Andersen WDH hitch
Dometic Milenco Aero mirrors