Why Fly,, Very hard to stop and smell the roses when you are flying (Find an attraction just off your route you wish to visit)
First: Winterize RV by DRY method (Blowing out lines) then before you leave get and sanatize a couple of 5 gallon Jerry Cans or other water containers, also some gallon jugs (recycled milk bottle, or a water bottle (Buy a gallons of distilled and top off your batteries or a gallon of spring water) and a funnel (to refill the gallon jug with)
Carry these INSIDE the RV, you can refill on the road if needed.
Once you are south of the Jack Frost line (Which is south of the Mason Dixon line by the way) you can then fill up your house system, sanatize if you feel the need. And stow the jugs for the trip north.
IF you head north before spring,, Same procedure when you get to the Jack Frost line, blow 'em out (you do carry a tank type air compressor right, I know I do) and go back to water inside.. Dump the wast tanks often and use the Truck Stop/Wal*mart/Campground toilets and such as much as possible.
You can also flush toilets with Pink Stuff (RV Antifreeze) if you do not have water in the system.
