Converting over to LED lights inside your coach will give you a big reductions in the 12VDC current required to operate the lights...
If you do them all then at least do a couple so you can only have them ON when you are setup off the power grid.
The cheapest way to get more battery power is going with two each 6VDC GOLF CART batteries in series which will give you around 225AHs capacity. Your single Interstate battery only gives you 85AHs In your case however you may not have enough room for two of these golf cart batteries... Seems like I hear alot of CLASS Cs install batteries under the outside door steps area. Others have a pull out drawer and by removing the drawer they end up with enough room in the battery compartment. I knew one guy installed batteries under the one bench table seat and vented to the outside... That might be a great place for your AGM type batteries which doesn't require an outside vent.
Roy Ken
