I'm getting a Jayco 28' BHBE any hints on the Battery System? I was told Amp Hours are important, The higher the better 250AMP Hour or Better? I was told it's better to get 2 - 6 volt compared to 1 - 12 volt and to hook up the 4 in a chain? I spend a lot of time in the Mountains and I have a Predator 8750 Generator which never failed me. Any advice?