Any kind of heating element is going to deplete your batteries quickly if you are not hooked up to a power source. On initial thought, I thought the 12 volt heaters were not a good idea, but they may work going down the road when you are plugged into your TV. At 80 watts each, I am not sure you could run all 3 at the same time, though....they are drawing almost 7 amps each (@ 12 volts) .
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Chap , DW Joy, and Fur Baby Sango
2017 F350 Lariat CCSB, SRW, 4x4, 6.7 PS
2017 Grand Design Reflection 337RLS
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