Is it imperative to have AGM batteries with a solar set-up? Why? Could you not just use 2 6v batteries (not AGM's)? Do they last longer? How much and are they really worth the price difference?
What are you going to power? Any idea of how many amp hours you consume over night? How many watts of solar? Heavy inverting to micro, toaster, hairdryer? Do you have room for the taller GC2 at 11.5 or so inches of height?