As you see that's by Chinook ( RIP 2006).
Chinook also did the Blazer Chalet, a similar treatment of the Chevy 4wd Blazer/ GMC Casa Grande for 1976, 7.
with a nice pop top.
I have a neighbor who had a couple of the Chalets.
and the Chinook B/ B+ models 19' to 24' using a "boat type" fiberglass construction, no pop top