Anyone have a recommendation for aux battery setup to use with inverter? From what I have read, the best way is to mount a second battery under the hood and hook it to the charging circuit with a relay kit so it's isolated from the starting battery. There seem to be alot of these kits out there - any recommendations/experiences to share? Just purchased a 2011 2500 van and I need an entertainment setup for the kids, so I'm thinking around 1500W for TV, Xbox, laptops and the like.