Looking for some opinions. I recently received an ARB 63 qt fridge as a gift. I also run a 900 watt amp and would like to add a few 12 volt and usb outlets in the back of my 100. I'm debating the need for a dual battery system vs just going with a group 31 and an antigravity jump pack and possibly a solar panel. I'll be using the fridge on camping trips and don't normally stay in one place for more than 1 or 2 nights. I'm thinking the single battery, jump pack, and solar would be enough for my needs, but am also a big believer in being over prepared and would hate to have the battery fail in the middle of nowhere without a backup. Opinions?