My 2021 JLUR has a DCDC charger that keeps the 100Ah LiFePO4 battery charged when the engine is on.
It also trickles power to my 2024 nuCamp T@B 320S BBC camping trailer over the 7-pin, thanks to the Tow Package, it is a 240 AMP alternator.
I need to disconnect the 7-pin when I'm stopped for the night, to prevent the JLUR starter battery from draining.
I haven't been able to sort out whether I need to get an Isolation Relay installed so I won't have to unplug the 7-pin anymore. Over my head.