I went to state trailer in redwood on my way home and got the battery box. They had trojan t105s ($195) and an interstate 6v deep cycle extreme ($190) something or other. I'm not going to justify that kind of money on this trailer from 2007. I went from there to the WVC Costco and got the two 6v gc2's. If I don't like them I'll go a different route down the road.