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We have run the 2 6V interstates since new. Lasted 5yrs. Replaced with same. On the 3rd yr now. No issues, we do run a charge wizard. We do also boondock some.
Now with the residential fridge we will bump up to 4 6V batts. SO will be good to boondock.
I you never boondock I would put in 2 12v batts like Mike said, creates a redundancy in case of a bad batt. Also gives that extra power for the Hyd etc. One battery could be marginal in case its used some when no power and you want to run slides etc.
Bill
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