I've always had mine covered, but only during the winter (nov. thru April). I'm on my 2nd one, they usually last 5-6 years. I wouldn't think of using it in the summer with trying to get it on and off between so many trips. I just keep it waxed during that time. I've always bought he Addco covers and they seem to be very durable for the price. They do not stick to the trailer. You do have to protect the corners where it goes over the gutters (I use bubble wrap). I do have a couple of spots where the cover wore the paint off, but that is down low and under the skirting where you can barely see it! Well worth it for off season storage!