Winter mode to keep coach plugged into ac

[Lford]

My land yacht 35xc diesel pusher motorhome i have winterized by air blowing out the lines.
With low 20's expected this weekend do i need to plug the coach up to AC for the batteries?
I have a manual cut off switch for the house batteries and they are off.
Your thoughts are welcome.

[israndy]

I have read the advice elsewhere to remove the batteries while your RV is in storage, keep them indoors, but NOT on a concrete floor. I found that inconvenient as my batteries are 200lbs, so I just make sure they are charged before the freezing time, so there is less water and more acid in them. Less likely to freeze.

-Randy