2005 Sunnybrook 2850, CONSTRUCTION All-Aluminum Bonded Superstructure S Tube Steel Chassis S 5/8" Tongue-And-Groove Exterior-Grade Plywood Floors S Floor Bonded and Screwed to Aluminum Floor Joist S 3/8" Roof Decking (1/2" with Rack and Ladder Option) S Tapered Aluminum Truss-Type Roof Rafters S R-7 Fiberglass Floor/Walls/ Roof Insulation S Fome-Cor ® Insulation on Aluminum-Sided Models S