A little different than the focus of your post, but because our new place currently only has a one car garage, I have been thinking of adding this for some of our outdoor equipment. It has good ratings even for snow shedding. I don't know if you have a tall top, but if you do you would likely have to add poles to raise the sides by at least four feet. With a 20% off coupon it is $168 w/o tax.
http://www.harborfreight.com/10-ft-x-17 ... 60727.html
These are where the CampingWorld.com rv covers start online:
http://www.campingworld.com/search/inde ... y=1&Ntpc=1
Others may have better experience, but my bad luck with car covers is that they promote rust.
[Good for you, I have a kite, but after a few unsuccessful lessons, I am afraid to use it. At least without more in the middle of the water boat supervised lessons.]