I know this reply is coming in a little late. We have the Tyvek version and are very satisfied with it. We clean up the trailer real well before covering it and it will look spic and span when we uncover it in the spring. We have covered roof vents so we do leave those open. One area of concern are the gutter downspouts. If you have the downspouts that stick out 3-4 inches on the corners you want to get you some tennis balls, punch holes in them and stick them on the downspouts. Otherwise, the downspouts will wear holes in the cover during the winter.
2013 Roo 183
2012: 1042 Miles, 13 Nights camped
2013: 2772 Miles, 27 Nights camped
2014: 2259 Miles, 30 Nights camped
2015: 1644 Miles, 20 Nights camped
2016: 550 Miles, 11 Nights camped