Winterizing an RV is generic. The only way to get model specific details is from someone who has the same unit however, since changes are made within a model year production, there is no guarantee that even that will be exact.
A search of "winterizing" in this forum yields over 500 threads with thousands of posts on the subject. A general you-tube search for "winterizing a class C rv" yields many results as well. Here is a link found with that search
parameter from a reputable dealer in Forest City, IA (W):
http://youtu.be/HAgpE6qSVVA
My solution is to move to S Florida. Low of 41* for one night here...