I have a 2015 21' Ice Castle RV that has two house batteries. I added the second to the house. It will run the furnace fan all night but it is running a lot slower by morning. There is a noticeable increase in fan speed when I start the generator in the morning. I am thinking of adding a third battery to the house to make up the difference.
Buddy was checking a few lakes yesterday and found 4.5" on a small lake on "White" ice and when he went to the "Clear" ice it was 2.5-3.5" He's hoping around today to see what he can find but he's not expecting too much. Few shallow protected lakes were covered so it'll only be time.