I may do something like this, but is it necessary? Does the wiring from the external SAE solar port connect directly to the batteries, or do they go to the onboard charge controller?
I have 2 portable 160 watt EcoFlow panels that do not have a controller. If the external wiring goes from the SAE connector to the charge controller, all I need is a MC4 to SAE adapter, and possibly a reverse polarity adapter if the trailer side has Zamp polarity.