RV storage covers aren't designed to be used when slide outs are open so there isn't going to be available that will allow you to keep your slide out extended. For a 30' travel trailer I recommend the Adco Olefin HD All-Climate + Wind RV Cover for Travel Trailer # AD27ZR.
This heavy duty cover is designed for long term storage in all climates. It has zippered panels on passenger's side to offer you easy access to trailer interior. Built-in vents allow air to escape in windy conditions... view full answer...
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