I bought a cover on Amazon, ADCO I think . My Box measures 28' so I purchased the 26-28' cover. Goes on and off easy, fits snug and has done a great job for 2 seasons now...just pulled it off.
Used a good fitting cover on my last camper for 8 years, worked great. Where I live an uncovered trailer gets very dirty over the fall/winter so I would not be without one.
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