Why leave your recreational vehicles unprotected in your storage facility. You protect your tires from the sun why not the whole vehicle. I often see people protecting their recreational vehicle tires by covering them to protect from dry rot.
How come they never think of protecting the whole vehicle so the exterior and interior don't receive damage? You can also go to https://www.tjsrv.com/rv-repair/ to get information about the experienced motorhome repair services in Concord.
There are two major problems with not covering your recreational vehicles in storage where the climate is wet and dry. In the West, the sun will damage the exterior paint and all the plastic parts to suck the life out of them.
Soon you will see your faded paint, oxidize and even cracked, all the plastic parts you will begin to shrink and crack as well. Your interior is also vulnerable in the sunlight west, for example, RV curtain will fall apart and the interior will receive sun damage such as fading and heat damage from high temps in your RV.
A good recreational cover can help and even stop all this damage. In the East where it rains a lot and high humidity levels, you will see the damage on the exterior such as rust and water leaks.
Most recreational vehicle exterior is made of aluminum but still there is a section of steel that will rust and cause problems down the road. The interior has a chance to be damaged by a water leak from the water setting on the roof and seeps into the seams to from time to time break.