I looked at GC batteries for my new Axis 24.1 and concluded that they were too high. I ended up replacing the original G24 or 27s with a pair of G31 AGMs from WindyNation about $190 ea on Amazon. They fit perfectly.
You might squeeze two GC batteries in but the problem you will have, given the tight height spec, is room for the interconnecting cables. Attached is a pic of mine with the new G31 batteries in place.
I stored the G24/27s in the adjacent compartment and may use them for extended dry camping trips by connecting them with a jumper to the main batteries. That will give me a total nominal capacity of about 350 Ahs.
David
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