Rustic Eagle, I also bought two Interstate 6V Deep Cycle batteries two weeks after I bought the new Jayflight 26BH. The 12V that came with the trailer is still sitting in my garage and I keep a trickle charger on it in case my roommate's older Pontiac nees a jump. I can go 4 full days when boondocking with out losing 12V power. I am very pleased with the choice.