Just replaced our oem batteries this morning in 2016 Vegas. I measured and could have put 29dc instead of 27dc if I move the breaker assembly at back of rack. I did not since we rarely park without being plugged in. I doubt 4 of any type would fit unless very compact.
The oem batteries will be used in boat for starting engine and trolling motor. In 5 years we have owned this is maybe 3rd time they took a little water.
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