It's based upon an Atlas, not a classic MoHo. For new Boeing CST-100 occupants -- er, pilots and passengers.
http://www.collectspace.com/news/new...airstream.html
And yes, it does indeed look like a rolling billboard, compared to the iconic classic it replaces:
(I suppose this type of thing is inevitable when industry completely takes over previously public endeavors. First it was our sports stadiums, now this, and next: "Exxon proudly presents, The Liberty Insurance Statue, sponsored by IBM - Do you have a tiger in your tank?" )