Unless the battery switch is off or the battery is disconnected it will drain down via LED circuitry, the TV, Stereo, etc. You might want to buy a battery tender and this will keep your battery charged up while not in use. Battery will drain if not isolated from the trailer circuits and this is normal and similar to leaving a car parked for a period of time.
Mike - Elmira, Mi / 2019 T@B 400 / 2021 Chevy Silverado LTZ
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2014 S Maxx
2011 Tacoma 4cyl ... edit: 2022 Tacoma 6cyl - oh yeah!
A_Little_T@b'll_Do_Ya