I have a similar setup - Optima under the bonnet and a home-built marine grade AGM 90Ah battery box in the back (portable as required).
Tim was very helpful with design advice when it came to connecting the battery box to the rear Anderson for charging on the go.
I also charge the whole lot (Optima, box and crank) in one hit with either the AC charger (Victron IP65/10A), or a 200W Amptron Solar MPPT setup, all from the one plug.
Works like a dream. Beer is always cold.
If at first you don't succeed, that's one data point. - xkcd
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2011 Discovery 4 SDV6 HSE
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