Dual batteries, DC to DC chargers, isolators, AGM... HELP!

i have to say im confused. this looks like a custom designed product for the jeep? an expensive one that's for sure? i find it hard to believe they didn't design for this.

that said if your just using the secondary battery and don't need it combined, then its easy, disconnect the second battery, connect the dc-dc charger to output of the second battery wiring from the genesis kit, and connect the output of the dc-dc to the second battery and that should be it.