We have owned three National coaches. Two of them were Tradewinds and one of those was a 2006. National only produced one style of Tradewinds that I am aware of. Now, I don't know what you mean by a "slanted front end," but our coach had no slant to the front end. By the way, it was a great coach.
I may be able to locate a few pictures. I will look to see. Can you send me an e-mail address through a PM that I can send them to?
2012 American Coach Revolution