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Remember that I'm trying to use an older Freedom 25 inverter for my charging and it doesn't allow much changes to the charge profile. With a newer inverter it would probably be much simpler. I'm trying to decide which way to go: either a new inverter or a separate charger. Either way offers different advantages. A separate charger could be set up to shut off after charge without floating (which is not recommended for these) but not sure how to automate the turn on since voltage changes so little during usage. The inverter would float so I'd have to decide at what voltage floating wouldn't cause problems.
Now Marc if you want a drop in replacement Lithionics makes one. But they are about $5000 for each 450 amp hour battery. According to my conversations with them they think 1 battery would be equivalent to 6 8D agms. I think you should try that with your new coach Think of the weight and space you'd save!