I am not fond of the NW set up because of the size of the batteries. I didn't like going to the Optima because it was a smaller battery and had less CCAs but I am in the South and fully expected to have a dual setup by now.
There is room to put another Optima on the PS frame rail behind the rear bumper. A univeral battery bracket will fit. I think it's something like 8"x14".
The problem I have with doing it is twofold. It's proximity to the exhaust. My DS has a wire right in the middle for the tag light and it could go there. Second, I have several things "up front" that need to run off the AUX battery and it's starting to defeat the purpose by locating it in the back, but it might be the only place to put it.
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