We have the 361LEV Raptor, 2010. The first cover, TYVEK, lasted 2 years and developed like 10 different rips.
The company made good on getting us a replacement. Now I use foam and duct tape to round off the corners and the edges of the slides.
It takes the wife on the ground and Me on the top of trailer about one good hour to put the cover on.
We first spread it out. I tie a rope to the front part and begin to pull it up by the open garage ramp. Once is dragged, carefully, to the front cab, the wife pulls the rope and we begin the spreading process. After securing all the strap buckles, I close all the zippers carefully.
We also remove the side ladder to give it a better fit and less area for the wind to get under it and rip it.