Danford50,
I feel that living in North Carolina in high humidity, you will need to drive your rig every few weeks only for the reason as not to let your brake rotors form a heavy rust on them. Just watch the rotors. If you see them rusty colored, it's time to go around the block and stop at each corner. You will also need to watch out for rodent damage. Mice like to crawl into the engine compartment to nest in places. While hanging out on your engine, they develop an appetite for wire insulation. Driving the rig on a regular basis for the brakes, also discourages rodents from moving in.
As far as all the mechanical stuff people discuss, I really don't think that will become an issue waiting one year, one time, if storing your rig outdoors. Our rig stays in our garage for 9 months at a time for 10 years now and we have never had any trouble with anything. I never run the main engine or generator during the 9 month down-period. I just fill the gas tank (no Stabil or other additives) to the top and disconnect the batteries and it's all good when we need it for a trip.
Ron Dittmer