I would recommend buying a multimeter with an integrated clamp amp meter. It is a great tool.
You can place the clamp around any single hot wire, and see how many amps is being pulled through the wire. For example, with the shore power disconnected you clamp around the main battery cable and see how much power is being drawn. This will show you total drain on your battery. Then you could locate various devices such as your CO/gas detector, or MYRV WIFI hub, clamp around the hot wire, and see what that device is pulling, and so forth. All those individual devices should add up to what is the battery reading was (note some items cycle like a refrigerator).
A multimeter is a great tool, and gets better when the clamp amp meter feature is added.
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