I have had 2 Avco covers, that were purchased at Camper's World in Tampa, Fl. Both lasted just 1 year and 11 months. The silver one is the one that I bought; it started flaking and coming apart, holes started appearing at the slightest tug. I phoned Avco and they sent me another one which lasted the same amount of time. The Florida Sun and the UV rays do a number on this material. So, I built a shed with a tin roof for the hilo. I would not park the HiLo in the Sun as a storage place. I always wash and wax the Hilo after a trip and use a roof cleaner on the roof before I park it for storage. I have a solar charger for the battery.
I'm sure that there is a cover out there that might last longer than a year and 11 months; just check the warranty before purchasing. Avoid any covers that are made in CHINA!!!!