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I didn't see anyone mention a float charger. My previous trailer (1997) had a trickle charger. Not a float charger. I disconnect the batteries from the trailer and fully charge them when I stored the trailer (subzero weather). I checked the batteries voltage about once a month. Most winters, I never had to charge them at all.
The trailer I have now (2014) has a float charger, so I leave it connected to shore power all winter. And a light on as well. Because I want to know if the power goes off. If it does it'll run the batteries down.
The difference between a float and a trickle charger is that the float charger shuts off when the battery fully charged. It constantly monitors the voltage, when it reaches a lower voltage, it'll start back up. Keeping the battery fully charged. I don't know what voltages triggers these actions.
A trickle charger sends a constant, low amperage, current to the battery. Can overcharge them quite easily.
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