From the Class B forum topic: In Europe, motorhomes on this chassis are very common (read 70% are on the Fiat Ducato chassis). However, here in the US, the vans and chassis are just starting...
I recall seeing some older class A's on online classifieds sites that had a drop down bed in the cab area. Also, a relatively newer short class A that had one about center of the coach. It was the primary and only bed in the MH.
The class A was the Safara Trek with a "Magic Bed"