secondary battery

I started this thread to chronicle the dual battery system we’re currently putting together. It’s being installed in a ’17 Toyota 4Runner but can easily be adapted to just about any vehicle. I’ve got some experience in wiring lights and building fuse/relay panels, but for this project I’ve...

Hi all I'm contemplating adding an auxiliary battery to my 2010 Tacoma V6. Do any of you know how to get around that upgrade? What do I need? Controllers? Which type of battery is better (deep cycle vs. regular) Wiring (gauge?) Brackets? Any help is really appreciated!