Hey team, I recently completed my "entry level" auxiliary battery setup on my 2006 V6 4R. It runs my little F40C4TMP fridge on Eco-Mode (35w off and on) for the time I need it to as well as charging my cell phone and insulin pump controller device.

I do have a Bluetti EB3A, but it discharges in about 5.5-6 hours and takes about 3-4 hours to recharge while driving via the cigarette lighter. The bigger and better units go up in price really quickly, and I wanted something to be more "stock" looking and for it to be able to stay in the truck at all times.

Battery: Renology 12v 100ah/10HR Deepcyle AGM
Isolator: Keyline 12v 140 Amp kit (comes with wires to connect the two batteries)
Cutoff Switches: Ampper Battery Switch 12-48V Master Cutoff
Fuse Block (in trunk): 6 fuse, 12v, ATC/ATO block.
Power Accessory Panel: Kohree 12v Marine Car Charger Socket Panel

Accessory panel wired to fuse block using 10g wire (no temp change while running fridge)

Renology wired to fuse block using 6g

Cutoff switches between two batteries and between Renology and fuse block

Pictures:

Renology

Renology

Renology

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Note: I figure I'll need something from redarc if I wanted to charge with solar and/or upgrade to lithium ion in the future, but running the AGM just charging off the main battery seems to be doing just fine! I am assuming that with a charger I could probably get the AGM up past 13V resting (?) but we will see. I was super pleased having the charge only drop from 12.8-12.9V down to 12.6-12.7V after having my things run on it for about 10 hours.