So I purchased a 2014 Colorado, it has a Anderson plug in the tray that is connected. I have used this plug to run fridges on day trips or an overnight stay, I now want to set up a dual battery to be able to run a fridge for a couple days + lights etc. I have some photos of the current set up with the Anderson plug, what’s the best way to connect a second battery in the tray utilising the Anderson plug already there? Also thinking a battery box so it’s portable to take into camp. I’m a bit clueless when it comes to electrics so thanks in advance.