So I just recently bought a 2004 Dodge Ram 1500 single cab with a camper shell. the first thing I am trying to do is install a power inverter in the bed of the truck so I can run my electric fridge and other electronics. Id like to install a second battery in the truck bed as well that I will be able to run external lights, a which and other such accessories off of as well as the camera shell accessories. right now I only have the one battery in the engine bay. I am looking for some advice on how to wire this and set it up for future add ons later. any help would be appreciated