When you're off-roading, what are your electrical loads? Does your truck have an engine driven or electric cooling fan? Does your truck have AC? When you say accessories, I assume you're talking about a winch and maybe some LED lights? Anything else? 12v fridge?
I would suggest also...
Better yet is a TOYOTA OEM upgraded harness WITH lights, for the same price.
Here is a visual:
https://www.ebay.com/itm/254484635820?chn=ps&mkevt=1&mkcid=28
Here is where to get it for $40:
https://parts.vescovotoyota.com/p/72018210/8111060P70.html
Granted, you gotta spend $75 for free...
Honestly, unless you're overlanding (like real overlanding, not just outfitting your truck to look like you overland) and doing self-sustained long trips away from civilization, I just don't see the actual NEED for dual batteries. I get that many people want them, but you gotta sort out if you...