Charging deep cell battery when trailer is in storage

I need to place my camper in storage and concerned how do I keep the deep cell battery charged during this storage. Last year my son had my trailer for 3 months and he did not charge it regularly and consequently the battery was stuffed. I want to make sure this does not happen again. What do other people do when their rig is in storage? The only thing I can fathom is go and get the trailer every three weeks or so and bring it home for charging. The battery is too heavy for me to lift in and out for charging at home. Hoping you experts will give me some answers.
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