Newly purchased and installed 18-20ft coverage. My trailer box, without a bumper or spare tire, was exactly 20 feet long, so I haven't decided whether to go 18 by 20 or 20 by 22 feet. Based on the Classic website stating that the cases have an extra 6"-12" in length, I ordered 18-20. From the previous suitcase I've had you know you want the smallest suitcase that you can comfortably fit it on to reduce the likelihood of wind damage etc. The cover was the perfect length to cover the bumper but not the spare tire, with just enough play not to stress the corners. That's exactly what I wanted. Other general observations, the cover seems very well made, with a heavier weight Tyvek top and light ripstop sides with heavy nylon bottoms on the corners and bottom. The ripstop sides made the weight very manageable and I put the case on myself in less than 30 minutes. Overall very impressed with the design and construction of the lid and had other brands. We'll see how it holds up, but it comes with a 4-year warranty, which is better than the 2-3 years that others are touting. Update Sold this trailer in Spring 2019. The lid has continued to hold up well and came with a tag. Bought a 'new' used 33ft trailer. And the first thing I did was buy the same case. So far I've had good experiences again, but unfortunately had to buy a slightly longer size for a pendant due to the size difference, but doesn't work that close to being made to measure. Even at this size I can undress and dress in half an hour and I'm 73 so it's very easy to manage. Update: after more than 2 years the experience needs to be updated. They held up well for 2 years and then the top and nylon sides literally fell apart in my hands. Two stars in two years
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