Wow, I had a Adco for mine and "almost" used it for three years. Two of those in Moab and I even used it sometimes during the hot summer, but mostly for the winters and it was in great condition when I moved to ID.
However, where I live now, I was able to park the trailer in the backyard, and forgot how tempting a piece of fabric blowing in the winds is to a Malamute looking for something to do.
However, when I went to replace it, the dealer suggested not to use a cover anymore. And I have to say, the trailer this year, after not using the cover, looks cleaner than when a cover was used, and I have found no damage.
Trailer: Lifted 228BH, heavy duty springs and Yokohama tires
TV: 2016 GMC Sierra Z71 4x4 CC, SLT
Spare TV: Two Alaskan Malamutes
Living somewhere in ID; previously lived in Moab UT; previous to that, don't ask!