I am setting op winch so can be used front and rear. Has been advised to use 00 cable to run to rear of truck, so either I run to cables +and- or I use chassis to run from rear to front and only run + to rear and short cable from chassis, I have also been told to upgrade. the - to chassis of both batteries, I also planned on connecting the 2 + together with a oo cable, only plan on connecting winch to one battery true the 500A breaker supplied with the winch. By the way my truck is a 2015
Frank.