PEOPLE - The hose did NOT work! We emptied our entire hot water tank onto it!
What finally worked is securing the cover to the roof, ice and all, as Dpinvidic suggested, and driving it 30 miles to a friend's garage and putting it inside for almost two days with space heaters going.
It is now residing at Camping World where they will determine if the ice, hot water and trying to pull the cover off did any damage to the roof.
Thanx for all the suggestions. We have always stored our motorhomes outside in our driveway with a canvas cover....First in Pennsylvania where we got a lot of ice and snow, and then on a Puget Sound Island where there are hardly any days where the temperatures fall below freezing. This is the first and only time this has happened.