Well the answer is that the right side defroster outlet was blocked. I didn't notice an abnormal amount of air coming out of the defroster vents driving home, but to tell you the truth, I wasn't look at it very hard either. But there was cold air coming out of that side, so I will look it over when we leave on Wednesday and report back.
I was told that you can never completely cut the air off to the defroster vents. I think this has something to do with the large windows and the amount of heat they pass, so to keep the front of the coach comfortable, air comes out these vents. Also, there are no dash vents on the passanger side, so that may also have something to do with it.