Anyone here running there batteries in the back of their outfit? Did you use frame as ground or second cable? I am using 2/0 for the power to my ford starter selinoid and use the selinoid as a J-box to mount my winch and cab power cables to.
Keep in mind if you want to double the amp hour rating by hooking the batteries in parallel then both batteries must be of the same CCA and size and be of the same age. Don't use one old battery and one new battery or you will kill the new battery.

this is formuds if this helps any
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