I have a 31Y model where the tray as others have stated allows for the addition of two more batteries. I added a third battery only. Bought it at Home Depot and the battery matches the two which came with the motorhome. They are Excide Nautilus 31MDC Deep Cycle Marine batteries. Adding the third battery is very challenging. I do not believe you could add a fourth battery with the amount of clearance you have. I had to add the cables to the additional battery then slide it to the back then add the original battery in and then connect the cables. Maintenance , checking of the water levels is impossible without removing the cables and one of the batteries and then sliding the additional battery to the front. Even adding an automatic watering system is next to impossible with the clearance available. When these batteries die, as others have stated, I will replace them with maintenance free AGMs.
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2018 Four Winds 31Y
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