Using your onboard converter in conjunction with the Onan generator is all you need in order for you to charge the bank of 6V's. Depending upon how much battery draw you anticipate using over 2-3 days of boon docking, 4 6v's should be sufficient to get you by over that time span.
With prudent use, those batteries should provide you with enough "juice" to last beyond 2-3 days.
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2008 Cougar 5th Wheel 27RKS
2005 2500 GMC Duramax
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