There's a PDF brochure of the FG-16 here that suggests it is fiberglass. My underlines added to an OCR attempt of the file:
: It has a tubular welded frame and electric brakes
as standard equipment. with the integral welded tubular frame firmly secured to the one piece fiberglass understructure
the unit has excellent towability to insure peace of mind while driving the low silhouette design, in conjunction with excellent weight
distribution over the axle
, provides a low center of gravity, giving you the most in safe, all-weather towing.
: The single seam, two-piece unitized fiberglass body
gives the owner a weather resistant, durable and rigid unit that features a shell which is easy to repair and nearly maintenance-tree. With the FG-16, you will never need to worry about wood-rot caused by a bad seam in the metal or about rot oxidation in the metal itself; there isn't any metal. And more important, the sound and solid unitized fiberglass body
replaces antiquated construction methods relying on screws, glue and staples that have a tendency to loosen in over-the-road use. The exterior of your FG-16 will not scratch, dent or ding, thus retaining its original beauty.
My favorite Line is in the beauty department:
: Both inside and out. the FG-16 is distinctively sleek. From the low line design concept of the stylish unitized fiberglass body...to the unique and exclusive undercarriage.-.and the tinted wIndows
with their rounded corners that provide the owner with over 38 square feet of natural light
...the FG-16 looks like it's on the go even when standing still.
The interior is appointed and designed for discriminate people seeking a unit that offers both practical comfort and contemporary charm.
Be sure to keep those wheels chocked!