I did receive my RV cover from Calmark. The shape of the Argosy 20' MH is unique but they did get it to match the shape pretty well.
There are zippers exactly where the door is so I can still go inside with the cover on. There are two heavy duty straps that run under the unit to hold it on. It also has a bottom string to pull it tight around the bottom.
I have read all of the controversy about covers. I understand the risks. I don't really have room for a carport type cover due to the hill/slope behind my house. The other alternative is to leave it uncovered and let the sun work away on the roof paint. We don't get that much wind since the unit sits behind my house.
Calmark has a pretty detailed measurement form. Unfortunately, my Argosy is a combination of the Airstream form and the Motorhome form!
Of course, my ultimate goal is to just drive to better weather but that can't happen this winter until the to-do list is complete!