Hello. I need to get a deep cycle RV battery for my Westfalia Campmobile. I'm seeing about a gazillion types with vastly varying prices. ($120-$600!) Is it really all that complicated or can I just get the cheap Sears Marine/RV battery? ($120) Also, I have noticed a lot of Westies with solar panels. Why? If they have a campsite with electrical hook-up the battery can charge itself. If not, the alternator will charge it during a short drive. I don't get it. Why would anybody want to drop $400 for a solar panel? (Tell me it isn't just to be "green".) Thanks for your time,... )< (- (_ (_ `(