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Bob, "B.C.", wrote that he suggested hooking up to the battery anyway because the antenna power wire isn't heavy. That's a good idea, but does your trailer happen to have LED lights, rather than incandescent bulbs? If so, your antenna wire would be more than adequate, because the LED trailer lights use a small fraction of the amps required of incandescents.
If your trailer is also a boat trailer.... I converted both of my trailers (for two boats) to LED lights -- not only less of a load on the car's systems, but they are impervious to moisture, so I can dunk the trailers in the water without worry of the lamp housings leaking, or doing a thermal shock to the hot bulbs (or alternatively have to always remember to disconnect the wires, and then remember to reconnect them when I starting driving). I really recommend them -- I use SeaSense brand, by the way.
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