I'm looking to put a canopy over my entire 24' (27' with tongue) Forrest River Sandpiper bumper pull RV. The Arizona sun is brutal and destroys the plastic pieces on the roof and takes a toll on the roof itself just in one summer, with our intense sun and heavy monsoon rain. I have also found that a layer that creates shade on a building greatly increases the need for as much A/C inside the building, so I'm looking at improving the temperature inside the trailer too. And the monsoon rains here are just as brutal as the sun and will worsen any slight leaks that I may not know about. So, I'm looking for a waterproof tarp/canopy/cover of some sort that sits a few feet above the top of the RV. I don't want anything with sides. I know I'll probably have to replace the canopy/tarp/cloth every year, but I'm ok with that. I was looking into buying a portable garage, but most are only 20ft long, and many are too short for an RV. I'm also looking to spend $400 or ideally a lot less. Is this something folks do? Any suggestions on this?