I recommend the Adco Olefin HD All-Climate + Wind RV Cover for Travel Trailer - Up to 28-1/2' Long - Gray # AD87ZR. It offers the best protection from sunlight, dust/sand/dirt, and all weather.
It is a long term storage cover made of heavy duty fabric that is contoured to match and fit the shapes of your RV. I really like how it is a breathable design and built in vents that allow air to escape and prevents moisture build up to combat mold growth.
Typically "All weather" type covers have... view full answer...