Wow! How are you going to get those recharged? Will your alternator be able to handle that? I've never really researched this and would like to know what you've found. You are designing a vehicle that has the size bank that I've only seen in large diesel trucks. I would love to have that kind of reserve
but I don't think I could get those charged in 2 days if taken low.
From the Web but is about marine alternators which are generally smaller. It still might apply:
The charge acceptance of AGMs can burn up an alternator if the charging system is not adequate for extended runtimes at full power. The larger the battery bank and the harder the charger is made to work, the more attention I would pay to ensuring that the charging system can handle the currents for extended periods of time. This caveat does not really apply to low-duty applications like starter banks, since they usually need so little charge to be topped up. Even the puny alternators found in Jet Skis should be able to handler an AGM starter battery, as long as that battery is just used for that - starting.
On the other hand, if you need a large house bank and want to rely on a single charge source for much of the power, I'd aim for a high quality charge. Ensure that the alternator receives enough cooling air as a hot alternator will produce less energy than a cool one and last longer to boot. AGMs and to a lesser extent gel cell systems can benefit from using the thermal alternator protection of regulators, particularly if you expect to bulk charge your system for extended periods of time and don't have good engine compartment ventilation.
The higher charge efficiency of AGMs allows you to recharge with less energy: Flooded cells convert 15-20% of the electrical energy into heat instead of potential power. Gel-cells lose 10-16% but AGMs as little as 4%. The higher charge efficiency of AGMs can contribute to significant savings when it comes to the use of expensive renewable energy sources (wind generators, solar panels, etc.) as your charging system can be 15% smaller (or just charge faster).