Just some food for thought...
That $200 might last you 2 years. Its kind of a pain to take off, fold up and store, then un pack and put on every trip. Its not going to do anything to help with and potential snow load. It can still get dirty (though significantly less) through the cover from rain draining through and bringing dirt and debris from leaves, etc.
My experience has been that people use the covers at first, then it becomes a hassle. They get home in the rain and don't put it back on. Or, they leave in the rain and it never dries out completely and they don't feel like messing with a dirty moldy cover.
If you bought a steel carport, it will last a lot longer, be easier to use (just park underneath) and less dependent upon good weather or helping hands everytime you come or go. The roof will help keep snow off your AV unit. You can go into your camper with the carport and check on things, pack, unpack, etc.
Its more expensive, but lasts way longer and is much easier to use.