I bought RT's because they were cheap at only $150 each. I used them when camping a few times without issue. I still would start my truck every few hours just to top them back up. Now my problem is in order to fit a larger battery in there I need to make a new box probably. Going to turn the alt down tonight to under 15 volts. Glad I have a fire extinguisher in my truck because I thought I was going to need it there.