Unless you do a fair amount of dry camping, there may not be a need for having 2 batteries. However, if you spend quite a bit of your time boondocking, then I would suggest getting 2 6v "golf cart" batteries as opposed to 2-12v. For 6v's, Trojan or Optima might be worth looking into.
There are numerous posts/threads already on the forum about this topic, so you might want to do a forum search of this topic.
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2008 Cougar 5th Wheel 27RKS
2005 2500 GMC Duramax
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