Another battery question

After a search on this forum and google, I am still a little lost on a battery alternative for my nortstar 650. It will be used 80% dry camping and I am considering solar as an add on. Is the idea of 2 6v in series or one 12v (wet cell or agm)the way to go and then, which brand? Has anyone with 2 6v ever had one fail? A good deep cycle wet cell with the associated maintenance would be where I am tending to go but would like other opinions as to some other advantage that I may be missing. Thanks