Pretty good advice given so far. I'd just add that your battery will last longer when it's kept charged fully as much as possible. That's why your current battery lasted so long, it was rarely discharged by camping with electric hook ups. When you stay for multiple days I'd set a limit on how low you allow the battery to get before recharging. I generally use about 75% for my two Trojan T 105s and I get from six to eight years from them even though they're used HARD. MOST of my camping is without hook ups and the batteries take a lot of charge/discharge cycles but only RARELY are they deeply discharged.