I don't get this at all!!
I "Winterize" 3 to 6 times a year, we four season camp here in NW Oregon. That said winterizing consists of draining the tanks, blowing the lines and a little antifreeze in the traps.
Our 5er is kept loaded and ready to all year round, so for winterizing blow the lines and antifreeze in the traps, takes all of 20 minutes. I blow the lines that long.
Blow the lines in October, and don't worry about until you head south. One days driving should get you far enough south that you will not need to worry about it.