I've used the ADCO cover in AZ and ID. Expect it to last about 3 years. The sun will destroy it. Maybe modern paints will weather the sun, but none of the plastic bits will and some are hard to source, not to mention the uv entering through the windows and the heat.
I have a Classic Accessories cover on my Travato right now. It is 1/2 the weight and way easier to put on. I don't know how long it will last as I've only used it for 1 year (4 seasons). If it lasts as long as the ADCO, I would buy another one just like it.
People will say covers will wear spots on the vehicle. I have never seen this. I don't put the van up dirty and I tie the cover down tight.
If I could have a garage or carport, I would. But I can't so the cover is the next best thing.
2006 Dynamax Isata 250 Touring Sedan
"Il Travato Rosso"
2015 Travato 59g