A method I use year round to eliminate having to open the trailer, which I keep in my garage, is to connect a trickle charger's ground lead to the frame of the trailer and the positive lead to the 12V pin of the Bargman 7-Circuit trailer end. While looking at the connector, hold it so the notch is in the upright (or in the 12:00) position. The pin in the 11:00 position (the #4 terminal) is the positive lead to the battery. I check the condition of the battery simply by turning on the external light and see if it is dim or you could also measure the voltage at the #4 pin.
I will then slow charge the battery for a day. This has worked very well for me.
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Dave
Cleveland, OH
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