I'm not familiar with the T-handle - apparently Minis have a somewhat different configuration. My bottom-line take-away is that for long-term storage (more than a week, maybe) do not leave the battery connected to anything in the trailer. Not the charger, not the load panel - nothing. From your description, the T-handle sounds like it accomplishes this, but I just don't know. To be sure about it, I would simply pull the cable off the battery's positive post. Once the battery is completely disconnected, you can attach the maintainer cables directly to the battery posts (assuming a maintainer is your choice of approaches).
Bill
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