I don't know what it is either, but you better snap it up quickly. Even if it is one of a kind, so much of the interiors (appliances, bath fittings) are common among brands that tyou would not have any trouble replacing them if necessary.
I love those big windows on the curb side. It does look like it could use some TLC, though.
I can confirm it is a "Carefree", manufactured in Genelle, BC. I went to see it today, it is in rough shape. I took 65 pictures for those that might be interested. I'll see if we can get some posted in the albums here. It is actually a 23 foot.
I think the model # came from the length 23 x 12 = 276.
Here is a link to the picture of the spec sheet I uploaded to tinypic.com:
Contact me if you want more pictures.