Found this from 2012: https://www.practicalcaravan.com/news/28787-everything-you-need-to-know-about-caravan-covers
I have experienced of a generic Maypole cover which was used to cover a 'classic' caravan, which had glass windows. It was a poor fit as the caravan was too small for even the smallest cover, but it kept the crap off. However, I was lazy and didn't bother to clean the caravan before covering, so the dirt got rubbed into the re-painted caravan sides and inside of the cover.... The Maypole cover touts that it has multiple breathable waterproof layers, which I do not doubt, but it is very heavy and thick; It was a real pain to get on as it opened via 2 zips on the side panel, but there was no device to help it over. Only the size and shape of my caravan meant it could be a one-person job.
For my Sprite, I have purchased a tailored Pro-Tec cover after using their Towing Jacket (both made from the same stuff) The Pro-Tec item is much thinner, which makes it smaller and lighter when packed and comes with a door-access panel and a roll-up rear panel, which combined with lifting poles (supplied) makes it easier to walk-over the van with 2 people. I'm yet to use it, as the van needs to be washed, but based on using the towing jacket, it should not cause scratching.