I never stop learning!

Big Boy jacks are the biggest Atwood makes. I can get the model number if you really need it. But some of the other forum members do not have the same size jacks on there camper, thus "mine go up and down all day with out a problem" type posts. The batteries have been replaced and fully charged. What I said previously was that all four jacks would not raise the camper with just one battery in place only two jacks were responding to the remote, if I push "all" on remote breaker tripped. So my deduction is that I need two batteries for proper operation. Again with the camper on shore power and one battery removed still no go. Thus my second deduction that they only operate on battery power.