We have a Classic on our 5th Wheel and we have had it for over 9 years, this fall will be #10. The issues with theses covers is weather and how tight they are on your rig. Buddy bought one the same year. Bought mine but he didn't have it tight enough and the wind would grab it and it would either catch on something a tear, or the rubbing on so thing caused by the wind would rub a hole right through it.
The zipper started to not work properly and the wife found on YouTube a way to fix that. We have had only two of the tabs that we hook the bungie cords to start to tear and all I did there was rub some clear silicone around the tear and it seams to be holding.
Soup.