Currently running a 2nd battery and amp into a truckbox this project is becoming a pain in the ass as I am doing it by myself so there is some trial and error. I want to see what you "pros" are running as battery(s). I am thinking of AGM battery and putting that in a Marine grade battery box and mounting the whole thing in the truckbox. I am using a Battery Doctor 150 isolator. what all do you run?