"The best laid plans of mice and men oft go astray" You may not plan to dry camp but doesn't mean that you might not be put into that position by conditions outside your control.
My opinion only but if I'm going to spend X number of dollars I would want the most amp-hours for those dollars whether that two 12 volt or four 6 volt.
Paul, Kathy, and Tux the Mini Schnauzer
2014 Tiffin Phaeton 42 LH, 2013 Honda CRV
"When the time comes to look back, make sure you'll like what you see"