We will be getting our new to us Keystone Everest tomorrow and one of the things the dealer found and corrected was that the two group 34 AGM batteries were bad so he replaced them with one group 27 d...
Two group 35 AGM? Is that Optima? Let them go as they have about 55 amp hours each vs the 27 with 110 amp hours. Worst case get two 27s for 220 amp hours. But if plugged in the single will be fine. More battery is generally only needed if camped off grid.