The UV rays from the sun cause paint, graphics, vinyl seats and trim pieces to deteriorate.
UV rays also break-down fiberglass laminates over time.
The interior of RVs can reach temperatures in excess of 140°F when stored outside.
Snow that piles up will add heavy loads to the roof of the camper.
Left unprotected, snow, sleet, and rain will find any leak and infiltrate the RV leading to deterioration.
Snow and rain will collapse a tarp or other covering leaving all of the water inside your boat for you to deal with come spring.
Dirt and debris build-up on the roof of campers that are left outside. This leads to clogged gutters, water back-up, and the much dreaded black streaks.