Calmark covers are the best made. They are made from Sunbrella material and will last for years, warranty is for 6 years. This cover is 2 1/2 yrs old and is still like new. If you have a Rockwood 2702 SS or similarly shaped model (see pic) with a 28' box this is well worth buying. This cover was $1100 new, asking $550 shipped. Check out Calmark's website.
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Calmark Cover