Hi Dan, I am guessing you camp similar to me, with minimal electrical requirements. Basically water pump, lights and refer? If so how long can you go without charging before your batteries get to 12.1 v? Do you have a way of equalizing your batteries with your current charger? If not a portable charger like the 40 amp Stanley or B&D is a good thing to have to do this. It will keep your batteries healthy longer. Lastly when these marine batteries do fail I would replace them with 6v GC batteries if you can fit them in your battery compartment, they will serve you better for dry camping and last longer.
