Ah! That is the one added. I purchased it right from the manufacturer though in a 100 foot roll.
I did not add it to the side of the coach as I not like where it would line up with some of the items on the side of the coach. So I ended up putting a U shape around the top of the coach so all the water would then run off the back left and right.
So in my case, I started at the back corner and run it along to top edge and then curved around the front to the other side and then all the way to the back. I then had the two back end slope down to the side of the coach to direct the water where I wanted it to fall off.
http://rvgutters.com/ezervgutters.aspx
Note my coach, but like this more or less...
Others who have seen it on our coach have added it.