It looks like the end caps are molded, and possibly the roof, but the side walls look like sheet material that would need a stud framework.
Bigfoot did have a line of
non-molded trailers, hence the comparison.
The floor plan of this one looks like a stretched out variation of a
Bigfoot "style" fifth-wheel.
IIRC, the Kodiak brand was insulated in a similar way to
Bigfoot.