That's a Big sofa. I suppose that if the sofa is 30' then it would need a large chassis to go along with it.
Sorry, I couldn't resist.
I think if you would contact an A/S dealer they should be able to find out the info for you and provide any pricing as well. The dealer would probably be the only one to help as everyone else would most likely be guessing since the 2012"s are just recently being ordered, made and sold.
"Never approach a bull from the front, a horse from the rear, or a fool from any direction"
-Old West Proverb-