Re: Newbie here. Maybe wrong forum but here goes.

There are some small C models with twin beds. Winnebago fuse comes to mind.
Fuse
Some like the Fuse are even on Sprinter chassis which is smaller, and more economical than the E series Fords. And these have been around long enough for there to be used units available.

"Certified" Dealers???
Not really except some that are certified rip offs.