I need to get one or more deep cycle batteries for my TT. I've learned a lot researching this forum about battery use & care for dry camping. While I do most of my own maintenance/repair, I don't know much about DC. My question: Does a 6v 100AH deliver the same amount of service as a 12v 100AH battery for operating RV electrical devices? I'm finding a 6v costs less than a 12v.