Just put my T.T. up for the winter, today. It is very important to wash your unit as the one post stated. You don't really want to have your cover over any dirt on your unit. Most important is the top, make sure to clean and remove all leaves, dirt, ect. My advise is to put it to bed like a child...CLEAN! It is a investment. Oh yeah, I have the same cover on my unit, nice choice. I was told a good rule of thumb is if the factory installed a ladder then the roof can be walked on, otherwise I would be careful as mentioned by others.