I bought a 20x18 cover on purpose for my 20x12x 13" high RV canopy. The additional width covers about 4' of each side when pulled down and secured with bunges. The cover price was reasonable, it was shipped promptly and arrived in perfect condition. Installation was accomplished by one person, and a latter in a few hours. This was my second or third purchase from Shelter Logis over ten years.  Only one car canopy was a replacement cover for a car canopy that was eight years old subject to New Mexico blowing sand and very hot summer tempetures.