That will work.
I leave my Navion outside in the summer, not plugged in, and let the rooftop solar do the work of charging the coach batteries, and I use a portable battery maintainer, plugged into one of the "inverter powered" AC outlets, and the other end into the 12V DC cigar lighter outlet under the ashtray, to keep the chassis battery up as well. That outlet is "always hot" to the chassis battery.
Some people prefer to wire a Triklstart unit into the coach/chassis battery wiring under the passenger seat, but I preferred a portable solution that doesn't require factory equipment modification.
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2018 (2017 Sprinter Cab Chassis) Navion24V + 2016 JKU (sold @ ????)
2016 Sunstar 26HE, V10, 3V, 6 Speed (sold @ 4600 miles)
2002 Roadtrek C190P (sold @ 315,000kms)
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