Charging second battery ( deep cycle group 31) carried in bed

[capttim]

I am interested to hear what others are doing on Tacoma Gen 4 Hybrids to charge a second battery. On my Gen 3, have successfully charged using a Delco solenoid transfer switch. Considering Victron Orion DC to DC-- but would be helpful to see how others are dealing with this. I also use 150 Watt solar array when stopped to camp -with Victron MPPT controller.
This question deals with charging while engine running. Thanks

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