If you have 2 six volt batteries and one goes bad for some reason, you would have NO DC battery power. If you have 4 six volt batteries and one goes bad, you can still run off of two of them. In addition, with 4 six volts you have double the power capacity/run time.
2011, 8314BSS Rockwood Signature Ultralite & 2005 Dodge Ram 2500, Quad-Cab, 5.9L Diesel, 4WD, 3.73
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2011 8314 BSS Rockwood Signature Ultralite
2005 Dodge Ram 2500 Quad-cab SLT