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Good discussion!? One more thought to add: keep in mind that when a 20 amp DC-DC converter/charger is first engaged, its charge current to a partially discharged camper battery is nearly 20 amps (19.5 amp typically) but it only remains at that level for a few seconds, before reducing rapidly to 15 then 10 amps or less.? My setup involves a TV battery/alternator mounted under the hood of my 2018 Ford Escape, with 8 awg positive and negative wires through a 50 amp fuse and 12 volt cut-off relay to the Bargman receptacle/plug and into the camper interior where the DC-DC converter/charger and battery are located aft of the axle.? Despite the distance, the setup works fine, largely because the typical run rate charging current is much less than the rated 20 amps.

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Dave

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P.S.? I agree with this comment:

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Bob, the dc charger pulls up to 50% more current on the input side than it puts out on the output side.? So a 30 amp dc charger can pull 45 amps from the TV, and your harness rated at 30 amps won't handle that.? I'd recommend sticking with 20 amp max.? That only pulls 30 amps max.?