Guessing, it could control the outside porch light or docking lights, could turn on the water heater by electric, could control the speakers in the bedroom, or maybe turn on the heated tanks for cold weather protection? Just guessing as I don't have the same trailer you do.
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2013 Tiffin Allegro 34 QFA
2015 Cadillac SRX (towed)
2019 Tesla Model X
1991 Avanti Conv
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