Yes, they are vacuum bonded, so the glue that can be a problem is in there. There is also some wood in the house under the roof fibergalss and in the floor. The house walls, roof and floor are similar to other "C" units, but with the composite material instead of wood in the walls, the crowned fiberglass roof which does wrap over into the top of the walls, and the fiberglas end caps. As I said, the house construction is as good as it gets for a regular Class C, especially at the transaction prices these go for. Cut and pasted from the brochure PDF:
MULTI-LAYERED LAMINATED ROOF SYSTEM
1 Crowned fiberglass roof
2 Luan decking
3 Block foam insulation
4 Dual A/C ducts
5 1.5" tubular aluminum framing
6 Interior ceiling material
2-INCH VACUUM-BOND LAMINATED SIDEWALLS
7 DECORATIVE INTERIOR WALL BOARD
8 1.5" TUBULAR ALUMINUM FRAMING
9 EGS METAL BACKERS
10 BLOCK FOAM INSULATION
11 OPENING FRAMED IN ALUMINUM
12 SUPERLITE COMPOSITE
13 SMOOTH GEL COAT FIBERGLASS EXTERIOR
VACUUM-BOND LAMINATED FLOOR SYSTEM
14 FIBERGLASS BOTTOM BOARD
15 BLOCK FOAM INSULATION
16 SEAMLESS FLOOR DECKING
17 BEAUFLOR FLOORING (IN SOME AREAS)
18 CARPET WITH PAD (IN SOME AREAS)
19 1.5" ALUMINUM FRAMING