The Arctic Fox 27 – 5L has a very convenient place to put batteries, in fact it's probably the most convenient place I've ever had in an RV to locate the batteries. It's handy to get to, it's built really strong, and the battery's slide in and out so it's easy to put water in them, so it really bothered me that I couldn't use that place. My battery dreams were much larger than the place that was provided. The two battery trays were too close together and the batteries I wanted were to tall to fit. But If all you want for your battery needs is two 12 V you will love the location that's provided.
Fortunately the Arctic Fox has a large storage bay in the front which has a really strong floor because that's normally where they put the generator. I didn't want the generator so that left me with plenty of space for batteries. Now you don't want to go putting your batteries in a compartment with any delicate electronic gear like your solar controller and your inverter, the gases from the battery could damage the equipment. So I needed a box to keep the batteries away from the other equipment. I could've built something, or I could've spent a small fortune buying a box designed for the job but I decided the easiest way was to buy an inexpensive ice chest from Walmart, I did a little measuring and the size was perfect.
Putting the batteries in the ice chest made them a little difficult to get to when they need to have water added. So I bought a battery watering system that allows me to add water to the batteries from an easy to use location which happens to be the battery compartment where they were supposed to be in the first place.