You might want to check the output voltage of your trickle charger and the converter in the trailer. If the voltage is too high, (or too low for that matter) that could be your problem. You might consider buying a good "smart" charger that can properly maintain your battery, If you have an IOTA brand converter, there is an add-on accessory that will "smarten-up" the stock converter. (Check the IOTA web site).
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