I'd add that it depends on how long you leave the trailer in storage between uses. If it's going to be in storage for a week or so, leave it plugged in so the converter can fully charge the batteries, prevent the parasitic drain and you can leave the refrigerator on electric so it stays cold, ready for the next trip.
On the other hand, if it's months between uses, it may be better to disconnect the battery and leave the trailer unplugged unless you can stop by about every two weeks to check the battery electrolyte level..
If the trailer only gets used in April and September, it may be even better to just remove the batteries and take them home to properly care for them. You could leave them in the trailer and leave it plugged in, but you would be making frequent trips to check on the battery and there's always a possibility that something else might stop working (like the converter or a circuit breaker from a surge, etc) that could interrupt power to the charging circuits.
So, one consideration for leaving it plugged in or removing the batteries is how long between trips.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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