If your coach is on the Sprinter chassis ADCO makes a windshield cover that should fit. They cost around 50.00. I had an ADCO for my class C. It took about 3 to 5 minutes to put it in place (outside) and worked like a champ for over three years. It did start to yellow late in the third year. The nice thing about it was that it covered the front and side windows.
If you go to this thread and look at post 23 (on page 2) you will see the ADCO in use on my prior class c.
http://www.thorforums.com/forums/f4/...-rig-1714.html