If you're really using a "trickle" charger, then you may have over-charged your battery. You want to use a smart battery maintainer, like the DelTran Battery Tender (for example).
Does the battery show full when you are on shore power? You could just be reading the charge voltage. Take the trailer's cable off of the battery and test it's voltage. Would be be better is to take the battery to an auto parts store and have them load test it.
Finally, is your battery disconnect set in the correct position? I think having this off can prevent a battery from charging while on shore power (I'm not 100% sure about this).
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2022 Cedar Creek Champagne 38EL - "Big Bertha"
2019 GMC Sierra 3500 Denali HD 6.6L Duramax TD, CC, 4WD, DRW - "Mr. Beefy"
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