I have a new 2013 Windjammer 3006wk waiting at the dealer for the weather to break...haven't had a chance to measure it BUT the dealer did tell me that whatever the sales brochure says for height includes the AC Unit. Again, I can't confirm this but it's what I was told by our dealer here in CNY.
I actually braved the snow to take a measurement and found the Rockwood brochure is incorrect. The height is actually 122" and includes the air conditioning unit. The brochuer should read 122" w/ air conditioner.
I assume you measured the 122" while the trailer was parked. Remeasure when you hook up to your TV. That is when you realy need to know the hieght, while you are trailering. Just one of the many things I have to do with my new 3008 this spring.