Living in Tucson, I'm quite familiar with winter storage here. Here's what I do:
1. Make sure the slides are in.
2. Spray the decals with 303 Aerospace to protect them from UV damage. If you have time, it's even better to wash and wax the rig with UV preventative wax.
3. Winterize the water system. You'd be surprised at how cold it can get in the winter in the greater Phoenix area. It can get down to the high teens or low twenties.
4. Cover the tires.
5. Prop the refrigerator and freezer doors open to keep them from developing mold or mildew.
6. fill the sink and shower traps with a water/RV antifreeze solution. Some folks put a small amount of olive oil in the traps to keep them from evaporating.
7. Top off the batteries with distilled water, and disconnect them.
Jim
2016 Ford F350 Turbo Diesel SRW 4x4
2017 Grand Design Reflection 297RSTS
2013 Ford F350 Turbo Diesel SRW 4x4 (Destroyed by fire - 8/29/16)
2014 Grand Design Reflection 337RLS (Destroyed by fire - 8/29/16)