You can get rid of the 'watt eating furnace' pretty easily with a catalytic unit. Camco sells them and they take no power to run. Even have Piezo ignition.
Had the same issue with my Lance (tinky battery box). My new camper had a plastic battery box under the front step with the electrics, pump and FW tank. That went to the landfill. I built a sealed wood box for twin batteries and incorporated the existing vent hoses.
Like I said way back, where I camp, sunlight is at a premium do I need a 46 pound boat anchor, but then I also take a chainsaw and extra fuel and bar oil as well.
