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The reason they don’t work well on 12 volts is that the 12 volt heating element only draws about 150 watts vs about 350 watts for the ac element.
You can set it up to run on ac through an inverter. If you run a heavy charge line (2 ga) from your truck batteries to your camper batteries it will handle the draw. My truck came with a 160 amp alternator. I have an amp meter installed in my system and usually see about a 35 amp charge but have seen as high as 50 amps to the camper batteries when driving and running my refrigerator on ac. Hope this helps.

2007 Dodge 3500 Dually 4x4
Cummins 5.9, 6sp, PAC
brake, Big Wig, Timbrens
2000 Lance 1130
2004 Jeep Rubicon