May I suggest visiting a farm supply store and checking out the aluminum colored tarps. They are cheap, but will last for a few years. I have one that's 20'X40' to cover our 5er. Cost is around $70. I use plenty of bungee cords to hold it down, and never have had enough wind to rip, tear, or blow it off. Some guys complain of a tarp wearing on the paint, but I've never encountered any wear spots on the RV.
2000 Winnebago Ultimate Freedom USQ40JD
, ISC 8.3 Cummins 350, Spartan MM Chassis. USA 1SG, retired;PPA,Good Sam Life member."We the people are the rightful masters of both the Congress and the Courts - not to overthrow the Constitution but to overthrow men who pervert theConstitution. "Abraham Lincoln"