This is what I used to build my dual battery setup, and i might be biased buts its the cleanest dual battery I've seen in a raptor.
REDARC Battery charger (BCDC1250D) x1 https://redarcelectronics.com/products/dual-input-50a-in-vehicle-dc-battery-charger 366.07
Genesis Off-road single battery holder (153-STBK) x1 https://www.genesisoffroad.com/universal-single-battery-kit 160
Odyssey 34-PC1500 Battery (34-PC1500) x1 https://www.genesisoffroad.com/group-34-battery 296
BEDSLIDE ALUMINUM BED INSTALL KIT (BSA-HALUMKT) x2 https://www.bedslide.com/i-30497593-bedslide-aluminum-bed-install-kit.html 16
6 gauge wire from main battery to REDARC
60A FUSE KIT (FK60) x2 https://redarcelectronics.com/products/60a-fuse-kit 43
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Wow, that is really nice! That's got many of the same concepts I plan to incorporate (bed cover, bedrug, DC-DC charger) and is very helpful. Couple questions:
1. How did you mount the Genesis battery holder to the bed?
2. What's the purpose of the aluminum track around the battery?
3. What loads do you run from the aux battery? Do you have free powerpoints you can tap into? Where are they mounted?