I have a cover for my C and yes, it is sometimes difficult to handle and it wants to wear in the corners, but it does a great job of protecting the RV from the AZ sun. The UV is brutal here. Before the cover, inside temps were routinely over 100 degrees in the summer and the graphics were fading. Not any more.
However, mine is an ADCO one size fits all that is supposed to fit an RV 23-26 feet long. Mine is 24 and there is no way to reef the extra material. It's just too big. It protects, but it looks horrible. If there was some system for gathering the extra length some where in the middle of the RV, it would be great, but alas.
Eric