A popup and regular camping trailer are the same in that the lights are 12 volt. The furnace, water pump and sometimes the refrigerator require 12 volts. If it has electric brakes they also need a source of 12 volts. Unless you have a very basic trailer there should be a converter that turns 120 AC into 12 volt dc to run the lights and any other 12 volt items and to recharge the battery. The battery provides the 12 volts to run lights and any other items you have when not plugged in.
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2017 SLX 195RB
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