Buy a tarp that covers the top and at least 2 to 3 feet on both sides and the front and back of the RV, and have it tied down, on the center roof of the RV plave a ridge manufactured with white pvc irigation pipe.
The construction of the ridge shoul look like an inverted "T" the upper part of the T long enough so that it does not tip over, place several of these inverted T's and connect them together at the bottom of the T's with t fittings and pipie running from one to the other, remenber that the "T"'s are upside down.
This ridge keeps the tarp of the roof and allows some of the water and snow to shed off, make shure that the tarps is tight on the sides, even if you have place more gromets to pass ropes to tie the tarp.
I hope it helps a little.
navegator
