My guess is that it is a Quigley, as the "4x4" decal on the rear looks like the same one they use.
We have a similar interior layout in our Ford EB and really like it. The mid-ship dinette/bed is easy to use and makes up into a nice size bed for two people. We have two full-height cabinets in the back, not just one like this SMB has, and they are great for clothing and other storage. You could easily add a second from the looks of it.
Also, if you would ever need to add a third captain's chair you could easily do it with this layout; that's what we did to gain a chair for our son (see viewtopic.php?f=13&t=9212