My Classic RV cover is still useable after about 5 years (I have done some patching on it). I think they are great protection from the sun, leaves, and snow. That being said they do have drawbacks. They are difficult to put on, They can rub on the finish, they can freeze down if taken off in winter (which I do), you have to pad all sharp edges on the 'RV to keep the cover from getting holes and rips. My motorhome does not currently have the cover on it but I hope to get it on before it snows and will take it off in Feb to go south. I probably should have put it on 2 months ago but kept putting it off as it is a job and makes it hard to get to the basement storage and entrance. If you use one make sure it is held
on securely, I use bungie cords to keep it tight in the wind etc. the ropes leave it too loose.