Working on adding the second Battery. Made some new hold down brackets from some scrap metal I had in the garage. Time for some lunch then I can finish wiring it in. Just need to tap the charge sensor wire, aka "alternator good" as @george_tlc calls it, that way it can activate my selenoid. Later down the line I might add my marine switch so I can link them to run a winch. For now the relay controller and all the other items in the back as well as the stereo and CB will be running off this second batt. Thanks to @george_tlc for the write up. And thanks to @yodaTEQ for the replacement battery tray for the DS since mine had some damage.