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I would suggest not to use the car batteries unless you have a dual system and they are Deep Discharge.
Yu wouldn't want to go to a dark sky only not be able to restart the car. Serious Grey Nomads have dual batteries for just the purpose.
I will configure my sealed lead acid in the back of the car so I can get access to them along with unloading. I also have a small solar panel that I will use for recharging possibly while I am driving to dark sites.
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