if you rarely dry camp or boondock and will only be staying one night, then one battery is fine.
if you plan on dry camping or boondocking for more than a couple of nights, then you should go to a two batteries setup. and think about an inverter generator to recharge the batteries.
we almost always dry camp so we have two 12v deep cycle batteries and a Honda 2000w inverter generator.
and Zoe the Wonder Dog(R.I.P.)
'07 Roo 23SS pushing an '07 Chevy Avalanche
Equalizer WDH and Prodigy BC