Also blow out the black water flush if you have one. Be sure you get all the water out of the shower sprayer including the elbow and the shower head (it holds water when the stop valve is closed). Blow out the outside shower/sprayer if there is one. Be sure to hit ALL the drains with antifreeze. Drain or blow out your external hoses (potable water hose and any extra hose).
Double check that all the water is out of your in-line water filter. If not, remove it and dump it (outside!) then consider if that means there may still be water in the system that has to be blown out again.
See attached great write-up which I found today in an Airsteam owners' magazine while having my Forester done by the dealer (not going to screw it up the first year!).
Being in Atlanta, you probably won't do the steps for putting antifreeze into the lines like we do up here in the frozen northland.