Do a search on here and you will get dozens of threads - some (like us) love them, others don't. A lot depends on how you use your trailer, and where you keep it and what kind of tree dirt, etc. can get on it. We use our trailer for longer vacations and trips like 4 times a year, usually with several months between trips. We love how clean and shiny and ready to go the trailer is when the cover comes off. It also helps keep wasps and other flying critters from taking up residence. I would advise going with a cover made of Sunbrella brand woven fabric rather than the non-woven Tyvec type material. It is nice and soft, light, and holds up well in sunlight. We have a custom made cover from CalMark which fits like a glove, but there are others using Sunbrella .....