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I run two 12 volt AGM's with a 2 amp solar panel for the few times I am not hooked to shore power or towing and charging from the truck. AGM's can sustain on a low charge rate and are the battery of choice for solar systems but they do not heat very much during charging and can withstand high charge rates better than conventional flooded cell units. Besides being spill proof and not requiring external venting, they have a true deep cycle capability and typically outlast other batteries in deep cycle use. They can survive freezing temperatures when fully discharged and come back and hold a charge. They are generally a bit larger and heavier than other 12 volt batteries. AGM's are also available in 6 volt batteries with amp hour capacities of up to 300 AH. They tend to be expensive but two of these will give you about 6 times the capacity of a standard 12 volt 100 AH AGM.
Hope this adds to the discussion.
My biggest issue with flooded cell batteries is they require maintenance, venting and they can leak.
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