Availability The sun is slightly brighter at 7000 feet. Since the motorhome is parked outside more often than driven, tires can age in the sun. Wheel covers prevent this. They come in multiple sizes and I had to check to find the right size. They were more than big enough when they arrived, but that works well. I mostly paid for the comfort and maybe a little for the fabric which seems quite durable. Since I usually park my van east facing, I only need hubcaps for the south side. So I bought two instead of four.