Build a climate controlled RV garage and your rig will look great for years to come. My 2008 Country Coach spent it's life in garages and looked new when I sold it last year. The people that bought it were in disbelief how nice it was.
When you live in AZ, as I do, the sun and heat are killers on paint, gel, stickers, tires, upholstery and so on. It's well worth paying for storage here if you don't have an RV garage. Most new houses where I'm at are built with RV garages for all of the toys.
2016 Forest River 3250 Cardinal
2016 RAM 2500 Longhorn
Previously: 36' Country Coach