1. Do not cover or shrink wrap here in FL. Humidity will have your coach a "moldy" mess in a short time. John is right about the "kiss of death". Also, you can't run your roof top a/c with a cover.
2. Go to storage and run that generator at least once a month for at least an hour with the a/c running.
3. Buy some of the flexible thin cutting board type mats. You can get them at Bed/Bath/Beyond in a 4 pack. Put them down for your tires to set on.
4. One year should not be a problem, just check your roof every 3 months and especially after one of our summer downpours.
5. Pay attention to rodent dropping in your bays. If you see any, put out some traps.
6. If you have max-air vents over you roof openings, leave them barely cracked (1/2") to help release some of the summer heat. Temps inside will reach high 90's and even low 100's at times.
7. If you can, rotate the direction of the parked coach every month to help with keeping any sun damage consistent on both sides.
8. Get the fuel tank as full as possible to help keep condensation down and bring a 5 gallon jug of fuel and refill after a few monthly runs. The worst months here for humidity and mold/mildew buildup are July, August and September with September being the worst of all especially when the Atlantic hurricane season peaks.
9. You can also protect your windshield wipers with a wrap of sorts and some tennis balls split to put under the wiper arms.
10. Mud-Dobbers will attack your coach beginning in March, so make sure all opening have some stainless steel wool in them. They also love a/c rooftop units and if you don't run the fan motor, they will build their nests on the blades.
11. No worries about any salt air in central Fl unless you are within a few hundred yards of the ocean. No problems with any of our vehicle rusting out and we are within three miles of the beach. Vehicles from the North are much more prone due to the salted roadways. That's one thing we don't have to worry about.
12. Don't worry too much as one year won't destroy anything and you should be in good shape when you are ready to leave.
Probably a few more things that I have missed but do on autopilot after living here for over 60 years. Good luck.