Anything you do to place your 'external' battery in parallel with the house batteries will charge them the same. The caution would be - if one battery is sick or bad, it will pull down the others. You electrical system doesn't know if you have one aux battery or two, or more. Or a 4D or two. It just sees low voltage and supplies a charge. Or is sees adequate voltage and stops supplying a charge.
If you have the Towing package, the outlet off the back should come from the starting batteries and be protected when the key is off.
Mike
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Alaska to Key West, Labrador and more
Prostate cancer survivor. See Thread Prostate cancer and Sportsmobiles
2015 VW GTI 2020 Fiat 124 Spider
2012 E250 Hitop camper
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